20621780

素因数分解:

$2^2\times 5^1\times {\mathrm{409}}^1\times {\mathrm{2521}}^1$

素因数の和:2939

約数の個数: 24

約数和(自身を含む): 43428840

約数和(自身を除く): 22807060

約数列:

[1, 2, 4, 5, 10, 20, 409, 818, 1636, 2045, 2521, 4090, 5042, 8180, 10084, 12605, 25210, 50420, 1031089, 2062178, 4124356, 5155445, 10310890, 20621780]

約数ペア:

[(1, 20621780), (2, 10310890), (4, 5155445), (5, 4124356), (10, 2062178), (20, 1031089), (409, 50420), (818, 25210), (1636, 12605), (2045, 10084), (2521, 8180), (4090, 5042)]