21278895

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{4447}}^1$

素因数の和:4495

約数の個数: 32

約数和(自身を含む): 38430720

約数和(自身を除く): 17151825

約数列:

[1, 3, 5, 11, 15, 29, 33, 55, 87, 145, 165, 319, 435, 957, 1595, 4447, 4785, 13341, 22235, 48917, 66705, 128963, 146751, 244585, 386889, 644815, 733755, 1418593, 1934445, 4255779, 7092965, 21278895]

約数ペア:

[(1, 21278895), (3, 7092965), (5, 4255779), (11, 1934445), (15, 1418593), (29, 733755), (33, 644815), (55, 386889), (87, 244585), (145, 146751), (165, 128963), (319, 66705), (435, 48917), (957, 22235), (1595, 13341), (4447, 4785)]