81264640

素因数分解:

$2^{19}\times 5^1\times {\mathrm{31}}^1$

素因数の和:74

約数の個数: 80

約数和(自身を含む): 201326400

約数和(自身を除く): 120061760

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, 992, 1024, 1240, 1280, 1984, 2048, 2480, 2560, 3968, 4096, 4960, 5120, 7936, 8192, 9920, 10240, 15872, 16384, 19840, 20480, 31744, 32768, 39680, 40960, 63488, 65536, 79360, 81920, 126976, 131072, 158720, 163840, 253952, 262144, 317440, 327680, 507904, 524288, 634880, 655360, 1015808, 1269760, 1310720, 2031616, 2539520, 2621440, 4063232, 5079040, 8126464, 10158080, 16252928, 20316160, 40632320, 81264640]

約数ペア:

[(1, 81264640), (2, 40632320), (4, 20316160), (5, 16252928), (8, 10158080), (10, 8126464), (16, 5079040), (20, 4063232), (31, 2621440), (32, 2539520), (40, 2031616), (62, 1310720), (64, 1269760), (80, 1015808), (124, 655360), (128, 634880), (155, 524288), (160, 507904), (248, 327680), (256, 317440), (310, 262144), (320, 253952), (496, 163840), (512, 158720), (620, 131072), (640, 126976), (992, 81920), (1024, 79360), (1240, 65536), (1280, 63488), (1984, 40960), (2048, 39680), (2480, 32768), (2560, 31744), (3968, 20480), (4096, 19840), (4960, 16384), (5120, 15872), (7936, 10240), (8192, 9920)]