21781767

素因数分解:

$3^1\times 7^1\times {\mathrm{67}}^1\times {\mathrm{113}}^1\times {\mathrm{137}}^1$

素因数の和:327

約数の個数: 32

約数和(自身を含む): 34232832

約数和(自身を除く): 12451065

約数列:

[1, 3, 7, 21, 67, 113, 137, 201, 339, 411, 469, 791, 959, 1407, 2373, 2877, 7571, 9179, 15481, 22713, 27537, 46443, 52997, 64253, 108367, 158991, 192759, 325101, 1037227, 3111681, 7260589, 21781767]

約数ペア:

[(1, 21781767), (3, 7260589), (7, 3111681), (21, 1037227), (67, 325101), (113, 192759), (137, 158991), (201, 108367), (339, 64253), (411, 52997), (469, 46443), (791, 27537), (959, 22713), (1407, 15481), (2373, 9179), (2877, 7571)]