21057790

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{161983}}^1$

素因数の和:162003

約数の個数: 16

約数和(自身を含む): 40819968

約数和(自身を除く): 19762178

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 161983, 323966, 809915, 1619830, 2105779, 4211558, 10528895, 21057790]

約数ペア:

[(1, 21057790), (2, 10528895), (5, 4211558), (10, 2105779), (13, 1619830), (26, 809915), (65, 323966), (130, 161983)]