21990340

素因数分解:

$2^2\times 5^1\times {\mathrm{853}}^1\times {\mathrm{1289}}^1$

素因数の和:2151

約数の個数: 24

約数和(自身を含む): 46269720

約数和(自身を除く): 24279380

約数列:

[1, 2, 4, 5, 10, 20, 853, 1289, 1706, 2578, 3412, 4265, 5156, 6445, 8530, 12890, 17060, 25780, 1099517, 2199034, 4398068, 5497585, 10995170, 21990340]

約数ペア:

[(1, 21990340), (2, 10995170), (4, 5497585), (5, 4398068), (10, 2199034), (20, 1099517), (853, 25780), (1289, 17060), (1706, 12890), (2578, 8530), (3412, 6445), (4265, 5156)]