20542640

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6263}}^1$

素因数の和:6317

約数の個数: 40

約数和(自身を含む): 48934368

約数和(自身を除く): 28391728

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6263, 12526, 25052, 31315, 50104, 62630, 100208, 125260, 250520, 256783, 501040, 513566, 1027132, 1283915, 2054264, 2567830, 4108528, 5135660, 10271320, 20542640]

約数ペア:

[(1, 20542640), (2, 10271320), (4, 5135660), (5, 4108528), (8, 2567830), (10, 2054264), (16, 1283915), (20, 1027132), (40, 513566), (41, 501040), (80, 256783), (82, 250520), (164, 125260), (205, 100208), (328, 62630), (410, 50104), (656, 31315), (820, 25052), (1640, 12526), (3280, 6263)]