21991515

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{16111}}^1$

素因数の和:16139

約数の個数: 32

約数和(自身を含む): 43309056

約数和(自身を除く): 21317541

約数列:

[1, 3, 5, 7, 13, 15, 21, 35, 39, 65, 91, 105, 195, 273, 455, 1365, 16111, 48333, 80555, 112777, 209443, 241665, 338331, 563885, 628329, 1047215, 1466101, 1691655, 3141645, 4398303, 7330505, 21991515]

約数ペア:

[(1, 21991515), (3, 7330505), (5, 4398303), (7, 3141645), (13, 1691655), (15, 1466101), (21, 1047215), (35, 628329), (39, 563885), (65, 338331), (91, 241665), (105, 209443), (195, 112777), (273, 80555), (455, 48333), (1365, 16111)]