21268988

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{73}}^1\times {\mathrm{431}}^1$

素因数の和:534

約数の個数: 36

約数和(自身を含む): 40951008

約数和(自身を除く): 19682020

約数列:

[1, 2, 4, 13, 26, 52, 73, 146, 169, 292, 338, 431, 676, 862, 949, 1724, 1898, 3796, 5603, 11206, 12337, 22412, 24674, 31463, 49348, 62926, 72839, 125852, 145678, 291356, 409019, 818038, 1636076, 5317247, 10634494, 21268988]

約数ペア:

[(1, 21268988), (2, 10634494), (4, 5317247), (13, 1636076), (26, 818038), (52, 409019), (73, 291356), (146, 145678), (169, 125852), (292, 72839), (338, 62926), (431, 49348), (676, 31463), (862, 24674), (949, 22412), (1724, 12337), (1898, 11206), (3796, 5603)]