21236780

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{13441}}^1$

素因数の和:13529

約数の個数: 24

約数和(自身を含む): 45165120

約数和(自身を除く): 23928340

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 13441, 26882, 53764, 67205, 134410, 268820, 1061839, 2123678, 4247356, 5309195, 10618390, 21236780]

約数ペア:

[(1, 21236780), (2, 10618390), (4, 5309195), (5, 4247356), (10, 2123678), (20, 1061839), (79, 268820), (158, 134410), (316, 67205), (395, 53764), (790, 26882), (1580, 13441)]