18987940

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{22079}}^1$

素因数の和:22131

約数の個数: 24

約数和(自身を含む): 40803840

約数和(自身を除く): 21815900

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 860, 22079, 44158, 88316, 110395, 220790, 441580, 949397, 1898794, 3797588, 4746985, 9493970, 18987940]

約数ペア:

[(1, 18987940), (2, 9493970), (4, 4746985), (5, 3797588), (10, 1898794), (20, 949397), (43, 441580), (86, 220790), (172, 110395), (215, 88316), (430, 44158), (860, 22079)]