21255730

素因数分解:

$2^1\times 5^1\times {\mathrm{409}}^1\times {\mathrm{5197}}^1$

素因数の和:5613

約数の個数: 16

約数和(自身を含む): 38361240

約数和(自身を除く): 17105510

約数列:

[1, 2, 5, 10, 409, 818, 2045, 4090, 5197, 10394, 25985, 51970, 2125573, 4251146, 10627865, 21255730]

約数ペア:

[(1, 21255730), (2, 10627865), (5, 4251146), (10, 2125573), (409, 51970), (818, 25985), (2045, 10394), (4090, 5197)]