21987020

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{139}}^1\times {\mathrm{719}}^1$

素因数の和:878

約数の個数: 48

約数和(自身を含む): 50803200

約数和(自身を除く): 28816180

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 139, 220, 278, 556, 695, 719, 1390, 1438, 1529, 2780, 2876, 3058, 3595, 6116, 7190, 7645, 7909, 14380, 15290, 15818, 30580, 31636, 39545, 79090, 99941, 158180, 199882, 399764, 499705, 999410, 1099351, 1998820, 2198702, 4397404, 5496755, 10993510, 21987020]

約数ペア:

[(1, 21987020), (2, 10993510), (4, 5496755), (5, 4397404), (10, 2198702), (11, 1998820), (20, 1099351), (22, 999410), (44, 499705), (55, 399764), (110, 199882), (139, 158180), (220, 99941), (278, 79090), (556, 39545), (695, 31636), (719, 30580), (1390, 15818), (1438, 15290), (1529, 14380), (2780, 7909), (2876, 7645), (3058, 7190), (3595, 6116)]