18818891

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{953}}^1$

素因数の和:1011

約数の個数: 24

約数和(自身を含む): 24361344

約数和(自身を除く): 5542453

約数列:

[1, 7, 13, 31, 49, 91, 217, 403, 637, 953, 1519, 2821, 6671, 12389, 19747, 29543, 46697, 86723, 206801, 384059, 607061, 1447607, 2688413, 18818891]

約数ペア:

[(1, 18818891), (7, 2688413), (13, 1447607), (31, 607061), (49, 384059), (91, 206801), (217, 86723), (403, 46697), (637, 29543), (953, 19747), (1519, 12389), (2821, 6671)]