21409947

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{181}}^1\times {\mathrm{337}}^1$

素因数の和:540

約数の個数: 32

約数和(自身を含む): 34448960

約数和(自身を除く): 13039013

約数列:

[1, 3, 9, 13, 27, 39, 117, 181, 337, 351, 543, 1011, 1629, 2353, 3033, 4381, 4887, 7059, 9099, 13143, 21177, 39429, 60997, 63531, 118287, 182991, 548973, 792961, 1646919, 2378883, 7136649, 21409947]

約数ペア:

[(1, 21409947), (3, 7136649), (9, 2378883), (13, 1646919), (27, 792961), (39, 548973), (117, 182991), (181, 118287), (337, 63531), (351, 60997), (543, 39429), (1011, 21177), (1629, 13143), (2353, 9099), (3033, 7059), (4381, 4887)]