21115815

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{28729}}^1$

素因数の和:28751

約数の個数: 24

約数和(自身を含む): 39302640

約数和(自身を除く): 18186825

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 147, 245, 735, 28729, 86187, 143645, 201103, 430935, 603309, 1005515, 1407721, 3016545, 4223163, 7038605, 21115815]

約数ペア:

[(1, 21115815), (3, 7038605), (5, 4223163), (7, 3016545), (15, 1407721), (21, 1005515), (35, 603309), (49, 430935), (105, 201103), (147, 143645), (245, 86187), (735, 28729)]