21258356

素因数分解:

$2^2\times 7^2\times {\mathrm{108461}}^1$

素因数の和:108479

約数の個数: 18

約数和(自身を含む): 43276338

約数和(自身を除く): 22017982

約数列:

[1, 2, 4, 7, 14, 28, 49, 98, 196, 108461, 216922, 433844, 759227, 1518454, 3036908, 5314589, 10629178, 21258356]

約数ペア:

[(1, 21258356), (2, 10629178), (4, 5314589), (7, 3036908), (14, 1518454), (28, 759227), (49, 433844), (98, 216922), (196, 108461)]