21245980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{5233}}^1$

素因数の和:5278

約数の個数: 48

約数和(自身を含む): 52758720

約数和(自身を除く): 31512740

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 58, 70, 116, 140, 145, 203, 290, 406, 580, 812, 1015, 2030, 4060, 5233, 10466, 20932, 26165, 36631, 52330, 73262, 104660, 146524, 151757, 183155, 303514, 366310, 607028, 732620, 758785, 1062299, 1517570, 2124598, 3035140, 4249196, 5311495, 10622990, 21245980]

約数ペア:

[(1, 21245980), (2, 10622990), (4, 5311495), (5, 4249196), (7, 3035140), (10, 2124598), (14, 1517570), (20, 1062299), (28, 758785), (29, 732620), (35, 607028), (58, 366310), (70, 303514), (116, 183155), (140, 151757), (145, 146524), (203, 104660), (290, 73262), (406, 52330), (580, 36631), (812, 26165), (1015, 20932), (2030, 10466), (4060, 5233)]