21054580

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{1171}}^1$

素因数の和:1240

約数の個数: 48

約数和(自身を含む): 47255040

約数和(自身を除く): 26200460

約数列:

[1, 2, 4, 5, 10, 20, 29, 31, 58, 62, 116, 124, 145, 155, 290, 310, 580, 620, 899, 1171, 1798, 2342, 3596, 4495, 4684, 5855, 8990, 11710, 17980, 23420, 33959, 36301, 67918, 72602, 135836, 145204, 169795, 181505, 339590, 363010, 679180, 726020, 1052729, 2105458, 4210916, 5263645, 10527290, 21054580]

約数ペア:

[(1, 21054580), (2, 10527290), (4, 5263645), (5, 4210916), (10, 2105458), (20, 1052729), (29, 726020), (31, 679180), (58, 363010), (62, 339590), (116, 181505), (124, 169795), (145, 145204), (155, 135836), (290, 72602), (310, 67918), (580, 36301), (620, 33959), (899, 23420), (1171, 17980), (1798, 11710), (2342, 8990), (3596, 5855), (4495, 4684)]