21405657

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{881}}^1$

素因数の和:993

約数の個数: 32

約数和(自身を含む): 35562240

約数和(自身を除く): 14156583

約数列:

[1, 3, 7, 13, 21, 39, 89, 91, 267, 273, 623, 881, 1157, 1869, 2643, 3471, 6167, 8099, 11453, 18501, 24297, 34359, 78409, 80171, 235227, 240513, 548863, 1019317, 1646589, 3057951, 7135219, 21405657]

約数ペア:

[(1, 21405657), (3, 7135219), (7, 3057951), (13, 1646589), (21, 1019317), (39, 548863), (89, 240513), (91, 235227), (267, 80171), (273, 78409), (623, 34359), (881, 24297), (1157, 18501), (1869, 11453), (2643, 8099), (3471, 6167)]