20781040

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{863}}^1$

素因数の和:926

約数の個数: 80

約数和(自身を含む): 56567808

約数和(自身を除く): 35786768

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 43, 56, 70, 80, 86, 112, 140, 172, 215, 280, 301, 344, 430, 560, 602, 688, 860, 863, 1204, 1505, 1720, 1726, 2408, 3010, 3440, 3452, 4315, 4816, 6020, 6041, 6904, 8630, 12040, 12082, 13808, 17260, 24080, 24164, 30205, 34520, 37109, 48328, 60410, 69040, 74218, 96656, 120820, 148436, 185545, 241640, 259763, 296872, 371090, 483280, 519526, 593744, 742180, 1039052, 1298815, 1484360, 2078104, 2597630, 2968720, 4156208, 5195260, 10390520, 20781040]

約数ペア:

[(1, 20781040), (2, 10390520), (4, 5195260), (5, 4156208), (7, 2968720), (8, 2597630), (10, 2078104), (14, 1484360), (16, 1298815), (20, 1039052), (28, 742180), (35, 593744), (40, 519526), (43, 483280), (56, 371090), (70, 296872), (80, 259763), (86, 241640), (112, 185545), (140, 148436), (172, 120820), (215, 96656), (280, 74218), (301, 69040), (344, 60410), (430, 48328), (560, 37109), (602, 34520), (688, 30205), (860, 24164), (863, 24080), (1204, 17260), (1505, 13808), (1720, 12082), (1726, 12040), (2408, 8630), (3010, 6904), (3440, 6041), (3452, 6020), (4315, 4816)]