21199867

素因数分解:

${\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{157}}^1$

素因数の和:247

約数の個数: 24

約数和(自身を含む): 24981696

約数和(自身を除く): 3781829

約数列:

[1, 13, 17, 47, 157, 169, 221, 611, 799, 2041, 2669, 2873, 7379, 7943, 10387, 26533, 34697, 95927, 125443, 135031, 451061, 1247051, 1630759, 21199867]

約数ペア:

[(1, 21199867), (13, 1630759), (17, 1247051), (47, 451061), (157, 135031), (169, 125443), (221, 95927), (611, 34697), (799, 26533), (2041, 10387), (2669, 7943), (2873, 7379)]