21491421

素因数分解:

$3^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{109}}^1\times {\mathrm{229}}^1$

素因数の和:389

約数の個数: 32

約数和(自身を含む): 34003200

約数和(自身を除く): 12511779

約数列:

[1, 3, 7, 21, 41, 109, 123, 229, 287, 327, 687, 763, 861, 1603, 2289, 4469, 4809, 9389, 13407, 24961, 28167, 31283, 65723, 74883, 93849, 174727, 197169, 524181, 1023401, 3070203, 7163807, 21491421]

約数ペア:

[(1, 21491421), (3, 7163807), (7, 3070203), (21, 1023401), (41, 524181), (109, 197169), (123, 174727), (229, 93849), (287, 74883), (327, 65723), (687, 31283), (763, 28167), (861, 24961), (1603, 13407), (2289, 9389), (4469, 4809)]