21390820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{97231}}^1$

素因数の和:97251

約数の個数: 24

約数和(自身を含む): 49004928

約数和(自身を除く): 27614108

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 97231, 194462, 388924, 486155, 972310, 1069541, 1944620, 2139082, 4278164, 5347705, 10695410, 21390820]

約数ペア:

[(1, 21390820), (2, 10695410), (4, 5347705), (5, 4278164), (10, 2139082), (11, 1944620), (20, 1069541), (22, 972310), (44, 486155), (55, 388924), (110, 194462), (220, 97231)]