20129920

素因数分解:

$2^7\times 5^1\times {\mathrm{71}}^1\times {\mathrm{443}}^1$

素因数の和:533

約数の個数: 64

約数和(自身を含む): 48911040

約数和(自身を除く): 28781120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 71, 80, 128, 142, 160, 284, 320, 355, 443, 568, 640, 710, 886, 1136, 1420, 1772, 2215, 2272, 2840, 3544, 4430, 4544, 5680, 7088, 8860, 9088, 11360, 14176, 17720, 22720, 28352, 31453, 35440, 45440, 56704, 62906, 70880, 125812, 141760, 157265, 251624, 283520, 314530, 503248, 629060, 1006496, 1258120, 2012992, 2516240, 4025984, 5032480, 10064960, 20129920]

約数ペア:

[(1, 20129920), (2, 10064960), (4, 5032480), (5, 4025984), (8, 2516240), (10, 2012992), (16, 1258120), (20, 1006496), (32, 629060), (40, 503248), (64, 314530), (71, 283520), (80, 251624), (128, 157265), (142, 141760), (160, 125812), (284, 70880), (320, 62906), (355, 56704), (443, 45440), (568, 35440), (640, 31453), (710, 28352), (886, 22720), (1136, 17720), (1420, 14176), (1772, 11360), (2215, 9088), (2272, 8860), (2840, 7088), (3544, 5680), (4430, 4544)]