21996020

素因数分解:

$2^2\times 5^1\times {\mathrm{409}}^1\times {\mathrm{2689}}^1$

素因数の和:3107

約数の個数: 24

約数和(自身を含む): 46321800

約数和(自身を除く): 24325780

約数列:

[1, 2, 4, 5, 10, 20, 409, 818, 1636, 2045, 2689, 4090, 5378, 8180, 10756, 13445, 26890, 53780, 1099801, 2199602, 4399204, 5499005, 10998010, 21996020]

約数ペア:

[(1, 21996020), (2, 10998010), (4, 5499005), (5, 4399204), (10, 2199602), (20, 1099801), (409, 53780), (818, 26890), (1636, 13445), (2045, 10756), (2689, 8180), (4090, 5378)]