21157790

素因数分解:

$2^1\times 5^1\times {\mathrm{431}}^1\times {\mathrm{4909}}^1$

素因数の和:5347

約数の個数: 16

約数和(自身を含む): 38180160

約数和(自身を除く): 17022370

約数列:

[1, 2, 5, 10, 431, 862, 2155, 4310, 4909, 9818, 24545, 49090, 2115779, 4231558, 10578895, 21157790]

約数ペア:

[(1, 21157790), (2, 10578895), (5, 4231558), (10, 2115779), (431, 49090), (862, 24545), (2155, 9818), (4310, 4909)]