21082820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{1571}}^1$

素因数の和:1652

約数の個数: 48

約数和(自身を含む): 49121856

約数和(自身を除く): 28039036

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 61, 110, 122, 220, 244, 305, 610, 671, 1220, 1342, 1571, 2684, 3142, 3355, 6284, 6710, 7855, 13420, 15710, 17281, 31420, 34562, 69124, 86405, 95831, 172810, 191662, 345620, 383324, 479155, 958310, 1054141, 1916620, 2108282, 4216564, 5270705, 10541410, 21082820]

約数ペア:

[(1, 21082820), (2, 10541410), (4, 5270705), (5, 4216564), (10, 2108282), (11, 1916620), (20, 1054141), (22, 958310), (44, 479155), (55, 383324), (61, 345620), (110, 191662), (122, 172810), (220, 95831), (244, 86405), (305, 69124), (610, 34562), (671, 31420), (1220, 17281), (1342, 15710), (1571, 13420), (2684, 7855), (3142, 6710), (3355, 6284)]