21279915

素因数分解:

$3^4\times 5^1\times {\mathrm{52543}}^1$

素因数の和:52560

約数の個数: 20

約数和(自身を含む): 38146944

約数和(自身を除く): 16867029

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52543, 157629, 262715, 472887, 788145, 1418661, 2364435, 4255983, 7093305, 21279915]

約数ペア:

[(1, 21279915), (3, 7093305), (5, 4255983), (9, 2364435), (15, 1418661), (27, 788145), (45, 472887), (81, 262715), (135, 157629), (405, 52543)]