19681280000

素因数分解:

$2^{15}\times 5^4\times {\mathrm{31}}^2$

素因数の和:112

約数の個数: 240

約数和(自身を含む): 50824555155

約数和(自身を除く): 31143275155

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 31, 32, 40, 50, 62, 64, 80, 100, 124, 125, 128, 155, 160, 200, 248, 250, 256, 310, 320, 400, 496, 500, 512, 620, 625, 640, 775, 800, 961, 992, 1000, 1024, 1240, 1250, 1280, 1550, 1600, 1922, 1984, 2000, 2048, 2480, 2500, 2560, 3100, 3200, 3844, 3875, 3968, 4000, 4096, 4805, 4960, 5000, 5120, 6200, 6400, 7688, 7750, 7936, 8000, 8192, 9610, 9920, 10000, 10240, 12400, 12800, 15376, 15500, 15872, 16000, 16384, 19220, 19375, 19840, 20000, 20480, 24025, 24800, 25600, 30752, 31000, 31744, 32000, 32768, 38440, 38750, 39680, 40000, 40960, 48050, 49600, 51200, 61504, 62000, 63488, 64000, 76880, 77500, 79360, 80000, 81920, 96100, 99200, 102400, 120125, 123008, 124000, 126976, 128000, 153760, 155000, 158720, 160000, 163840, 192200, 198400, 204800, 240250, 246016, 248000, 253952, 256000, 307520, 310000, 317440, 320000, 384400, 396800, 409600, 480500, 492032, 496000, 507904, 512000, 600625, 615040, 620000, 634880, 640000, 768800, 793600, 819200, 961000, 984064, 992000, 1015808, 1024000, 1201250, 1230080, 1240000, 1269760, 1280000, 1537600, 1587200, 1922000, 1968128, 1984000, 2048000, 2402500, 2460160, 2480000, 2539520, 2560000, 3075200, 3174400, 3844000, 3936256, 3968000, 4096000, 4805000, 4920320, 4960000, 5079040, 5120000, 6150400, 6348800, 7688000, 7872512, 7936000, 9610000, 9840640, 9920000, 10240000, 12300800, 12697600, 15376000, 15745024, 15872000, 19220000, 19681280, 19840000, 20480000, 24601600, 25395200, 30752000, 31490048, 31744000, 38440000, 39362560, 39680000, 49203200, 61504000, 63488000, 76880000, 78725120, 79360000, 98406400, 123008000, 126976000, 153760000, 157450240, 158720000, 196812800, 246016000, 307520000, 317440000, 393625600, 492032000, 615040000, 634880000, 787251200, 984064000, 1230080000, 1968128000, 2460160000, 3936256000, 4920320000, 9840640000, 19681280000]

約数ペア:

[(1, 19681280000), (2, 9840640000), (4, 4920320000), (5, 3936256000), (8, 2460160000), (10, 1968128000), (16, 1230080000), (20, 984064000), (25, 787251200), (31, 634880000), (32, 615040000), (40, 492032000), (50, 393625600), (62, 317440000), (64, 307520000), (80, 246016000), (100, 196812800), (124, 158720000), (125, 157450240), (128, 153760000), (155, 126976000), (160, 123008000), (200, 98406400), (248, 79360000), (250, 78725120), (256, 76880000), (310, 63488000), (320, 61504000), (400, 49203200), (496, 39680000), (500, 39362560), (512, 38440000), (620, 31744000), (625, 31490048), (640, 30752000), (775, 25395200), (800, 24601600), (961, 20480000), (992, 19840000), (1000, 19681280), (1024, 19220000), (1240, 15872000), (1250, 15745024), (1280, 15376000), (1550, 12697600), (1600, 12300800), (1922, 10240000), (1984, 9920000), (2000, 9840640), (2048, 9610000), (2480, 7936000), (2500, 7872512), (2560, 7688000), (3100, 6348800), (3200, 6150400), (3844, 5120000), (3875, 5079040), (3968, 4960000), (4000, 4920320), (4096, 4805000), (4805, 4096000), (4960, 3968000), (5000, 3936256), (5120, 3844000), (6200, 3174400), (6400, 3075200), (7688, 2560000), (7750, 2539520), (7936, 2480000), (8000, 2460160), (8192, 2402500), (9610, 2048000), (9920, 1984000), (10000, 1968128), (10240, 1922000), (12400, 1587200), (12800, 1537600), (15376, 1280000), (15500, 1269760), (15872, 1240000), (16000, 1230080), (16384, 1201250), (19220, 1024000), (19375, 1015808), (19840, 992000), (20000, 984064), (20480, 961000), (24025, 819200), (24800, 793600), (25600, 768800), (30752, 640000), (31000, 634880), (31744, 620000), (32000, 615040), (32768, 600625), (38440, 512000), (38750, 507904), (39680, 496000), (40000, 492032), (40960, 480500), (48050, 409600), (49600, 396800), (51200, 384400), (61504, 320000), (62000, 317440), (63488, 310000), (64000, 307520), (76880, 256000), (77500, 253952), (79360, 248000), (80000, 246016), (81920, 240250), (96100, 204800), (99200, 198400), (102400, 192200), (120125, 163840), (123008, 160000), (124000, 158720), (126976, 155000), (128000, 153760)]