28021940

素因数分解:

$2^2\times 5^1\times {\mathrm{643}}^1\times {\mathrm{2179}}^1$

素因数の和:2831

約数の個数: 24

約数和(自身を含む): 58964640

約数和(自身を除く): 30942700

約数列:

[1, 2, 4, 5, 10, 20, 643, 1286, 2179, 2572, 3215, 4358, 6430, 8716, 10895, 12860, 21790, 43580, 1401097, 2802194, 5604388, 7005485, 14010970, 28021940]

約数ペア:

[(1, 28021940), (2, 14010970), (4, 7005485), (5, 5604388), (10, 2802194), (20, 1401097), (643, 43580), (1286, 21790), (2179, 12860), (2572, 10895), (3215, 8716), (4358, 6430)]