21315789

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{139}}^1\times {\mathrm{1549}}^1$

素因数の和:1705

約数の個数: 24

約数和(自身を含む): 33852000

約数和(自身を除く): 12536211

約数列:

[1, 3, 9, 11, 33, 99, 139, 417, 1251, 1529, 1549, 4587, 4647, 13761, 13941, 17039, 51117, 153351, 215311, 645933, 1937799, 2368421, 7105263, 21315789]

約数ペア:

[(1, 21315789), (3, 7105263), (9, 2368421), (11, 1937799), (33, 645933), (99, 215311), (139, 153351), (417, 51117), (1251, 17039), (1529, 13941), (1549, 13761), (4587, 4647)]