20405781

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{109}}^1$

素因数の和:218

約数の個数: 48

約数和(自身を含む): 34045440

約数和(自身を除く): 13639659

約数列:

[1, 3, 9, 11, 31, 33, 61, 93, 99, 109, 183, 279, 327, 341, 549, 671, 981, 1023, 1199, 1891, 2013, 3069, 3379, 3597, 5673, 6039, 6649, 10137, 10791, 17019, 19947, 20801, 30411, 37169, 59841, 62403, 73139, 111507, 187209, 206119, 219417, 334521, 618357, 658251, 1855071, 2267309, 6801927, 20405781]

約数ペア:

[(1, 20405781), (3, 6801927), (9, 2267309), (11, 1855071), (31, 658251), (33, 618357), (61, 334521), (93, 219417), (99, 206119), (109, 187209), (183, 111507), (279, 73139), (327, 62403), (341, 59841), (549, 37169), (671, 30411), (981, 20801), (1023, 19947), (1199, 17019), (1891, 10791), (2013, 10137), (3069, 6649), (3379, 6039), (3597, 5673)]