21790190

素因数分解:

$2^1\times 5^1\times {\mathrm{109}}^1\times {\mathrm{19991}}^1$

素因数の和:20107

約数の個数: 16

約数和(自身を含む): 39584160

約数和(自身を除く): 17793970

約数列:

[1, 2, 5, 10, 109, 218, 545, 1090, 19991, 39982, 99955, 199910, 2179019, 4358038, 10895095, 21790190]

約数ペア:

[(1, 21790190), (2, 10895095), (5, 4358038), (10, 2179019), (109, 199910), (218, 99955), (545, 39982), (1090, 19991)]