20491653

素因数分解:

$3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{10723}}^1$

素因数の和:10753

約数の個数: 24

約数和(自身を含む): 34231008

約数和(自身を除く): 13739355

約数列:

[1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637, 1911, 10723, 32169, 75061, 139399, 225183, 418197, 525427, 975793, 1576281, 2927379, 6830551, 20491653]

約数ペア:

[(1, 20491653), (3, 6830551), (7, 2927379), (13, 1576281), (21, 975793), (39, 525427), (49, 418197), (91, 225183), (147, 139399), (273, 75061), (637, 32169), (1911, 10723)]