20987655

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{2503}}^1$

素因数の和:2567

約数の個数: 32

約数和(自身を含む): 37019136

約数和(自身を除く): 16031481

約数列:

[1, 3, 5, 13, 15, 39, 43, 65, 129, 195, 215, 559, 645, 1677, 2503, 2795, 7509, 8385, 12515, 32539, 37545, 97617, 107629, 162695, 322887, 488085, 538145, 1399177, 1614435, 4197531, 6995885, 20987655]

約数ペア:

[(1, 20987655), (3, 6995885), (5, 4197531), (13, 1614435), (15, 1399177), (39, 538145), (43, 488085), (65, 322887), (129, 162695), (195, 107629), (215, 97617), (559, 37545), (645, 32539), (1677, 12515), (2503, 8385), (2795, 7509)]