21088040

素因数分解:

$2^3\times 5^1\times {\mathrm{409}}^1\times {\mathrm{1289}}^1$

素因数の和:1709

約数の個数: 32

約数和(自身を含む): 47601000

約数和(自身を除く): 26512960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 409, 818, 1289, 1636, 2045, 2578, 3272, 4090, 5156, 6445, 8180, 10312, 12890, 16360, 25780, 51560, 527201, 1054402, 2108804, 2636005, 4217608, 5272010, 10544020, 21088040]

約数ペア:

[(1, 21088040), (2, 10544020), (4, 5272010), (5, 4217608), (8, 2636005), (10, 2108804), (20, 1054402), (40, 527201), (409, 51560), (818, 25780), (1289, 16360), (1636, 12890), (2045, 10312), (2578, 8180), (3272, 6445), (4090, 5156)]