21781870

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{198017}}^1$

素因数の和:198035

約数の個数: 16

約数和(自身を含む): 42771888

約数和(自身を除く): 20990018

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 198017, 396034, 990085, 1980170, 2178187, 4356374, 10890935, 21781870]

約数ペア:

[(1, 21781870), (2, 10890935), (5, 4356374), (10, 2178187), (11, 1980170), (22, 990085), (55, 396034), (110, 198017)]