21122972

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{31247}}^1$

素因数の和:31277

約数の個数: 18

約数和(自身を含む): 40028688

約数和(自身を除く): 18905716

約数列:

[1, 2, 4, 13, 26, 52, 169, 338, 676, 31247, 62494, 124988, 406211, 812422, 1624844, 5280743, 10561486, 21122972]

約数ペア:

[(1, 21122972), (2, 10561486), (4, 5280743), (13, 1624844), (26, 812422), (52, 406211), (169, 124988), (338, 62494), (676, 31247)]