19681280

素因数分解:

$2^{12}\times 5^1\times {\mathrm{31}}^2$

素因数の和:91

約数の個数: 78

約数和(自身を含む): 48801978

約数和(自身を除く): 29120698

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 256, 310, 320, 496, 512, 620, 640, 961, 992, 1024, 1240, 1280, 1922, 1984, 2048, 2480, 2560, 3844, 3968, 4096, 4805, 4960, 5120, 7688, 7936, 9610, 9920, 10240, 15376, 15872, 19220, 19840, 20480, 30752, 31744, 38440, 39680, 61504, 63488, 76880, 79360, 123008, 126976, 153760, 158720, 246016, 307520, 317440, 492032, 615040, 634880, 984064, 1230080, 1968128, 2460160, 3936256, 4920320, 9840640, 19681280]

約数ペア:

[(1, 19681280), (2, 9840640), (4, 4920320), (5, 3936256), (8, 2460160), (10, 1968128), (16, 1230080), (20, 984064), (31, 634880), (32, 615040), (40, 492032), (62, 317440), (64, 307520), (80, 246016), (124, 158720), (128, 153760), (155, 126976), (160, 123008), (248, 79360), (256, 76880), (310, 63488), (320, 61504), (496, 39680), (512, 38440), (620, 31744), (640, 30752), (961, 20480), (992, 19840), (1024, 19220), (1240, 15872), (1280, 15376), (1922, 10240), (1984, 9920), (2048, 9610), (2480, 7936), (2560, 7688), (3844, 5120), (3968, 4960), (4096, 4805)]