18720765

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{103}}^1\times {\mathrm{577}}^1$

素因数の和:698

約数の個数: 48

約数和(自身を含む): 37509888

約数和(自身を除く): 18789123

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 103, 105, 309, 315, 515, 577, 721, 927, 1545, 1731, 2163, 2885, 3605, 4039, 4635, 5193, 6489, 8655, 10815, 12117, 20195, 25965, 32445, 36351, 59431, 60585, 178293, 181755, 297155, 416017, 534879, 891465, 1248051, 2080085, 2674395, 3744153, 6240255, 18720765]

約数ペア:

[(1, 18720765), (3, 6240255), (5, 3744153), (7, 2674395), (9, 2080085), (15, 1248051), (21, 891465), (35, 534879), (45, 416017), (63, 297155), (103, 181755), (105, 178293), (309, 60585), (315, 59431), (515, 36351), (577, 32445), (721, 25965), (927, 20195), (1545, 12117), (1731, 10815), (2163, 8655), (2885, 6489), (3605, 5193), (4039, 4635)]