20402560

素因数分解:

$2^7\times 5^1\times {\mathrm{71}}^1\times {\mathrm{449}}^1$

素因数の和:539

約数の個数: 64

約数和(自身を含む): 49572000

約数和(自身を除く): 29169440

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 71, 80, 128, 142, 160, 284, 320, 355, 449, 568, 640, 710, 898, 1136, 1420, 1796, 2245, 2272, 2840, 3592, 4490, 4544, 5680, 7184, 8980, 9088, 11360, 14368, 17960, 22720, 28736, 31879, 35920, 45440, 57472, 63758, 71840, 127516, 143680, 159395, 255032, 287360, 318790, 510064, 637580, 1020128, 1275160, 2040256, 2550320, 4080512, 5100640, 10201280, 20402560]

約数ペア:

[(1, 20402560), (2, 10201280), (4, 5100640), (5, 4080512), (8, 2550320), (10, 2040256), (16, 1275160), (20, 1020128), (32, 637580), (40, 510064), (64, 318790), (71, 287360), (80, 255032), (128, 159395), (142, 143680), (160, 127516), (284, 71840), (320, 63758), (355, 57472), (449, 45440), (568, 35920), (640, 31879), (710, 28736), (898, 22720), (1136, 17960), (1420, 14368), (1796, 11360), (2245, 9088), (2272, 8980), (2840, 7184), (3592, 5680), (4490, 4544)]