20008280

素因数分解:

$2^3\times 5^1\times {\mathrm{409}}^1\times {\mathrm{1223}}^1$

素因数の和:1643

約数の個数: 32

約数和(自身を含む): 45165600

約数和(自身を除く): 25157320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 409, 818, 1223, 1636, 2045, 2446, 3272, 4090, 4892, 6115, 8180, 9784, 12230, 16360, 24460, 48920, 500207, 1000414, 2000828, 2501035, 4001656, 5002070, 10004140, 20008280]

約数ペア:

[(1, 20008280), (2, 10004140), (4, 5002070), (5, 4001656), (8, 2501035), (10, 2000828), (20, 1000414), (40, 500207), (409, 48920), (818, 24460), (1223, 16360), (1636, 12230), (2045, 9784), (2446, 8180), (3272, 6115), (4090, 4892)]