20213980

素因数分解:

$2^2\times 5^1\times {\mathrm{449}}^1\times {\mathrm{2251}}^1$

素因数の和:2709

約数の個数: 24

約数和(自身を含む): 42562800

約数和(自身を除く): 22348820

約数列:

[1, 2, 4, 5, 10, 20, 449, 898, 1796, 2245, 2251, 4490, 4502, 8980, 9004, 11255, 22510, 45020, 1010699, 2021398, 4042796, 5053495, 10106990, 20213980]

約数ペア:

[(1, 20213980), (2, 10106990), (4, 5053495), (5, 4042796), (10, 2021398), (20, 1010699), (449, 45020), (898, 22510), (1796, 11255), (2245, 9004), (2251, 8980), (4490, 4502)]