20687967

素因数分解:

$3^4\times {\mathrm{53}}^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1$

素因数の和:205

約数の個数: 40

約数和(自身を含む): 32408640

約数和(自身を除く): 11720673

約数列:

[1, 3, 9, 27, 53, 61, 79, 81, 159, 183, 237, 477, 549, 711, 1431, 1647, 2133, 3233, 4187, 4293, 4819, 4941, 6399, 9699, 12561, 14457, 29097, 37683, 43371, 87291, 113049, 130113, 255407, 261873, 339147, 390339, 766221, 2298663, 6895989, 20687967]

約数ペア:

[(1, 20687967), (3, 6895989), (9, 2298663), (27, 766221), (53, 390339), (61, 339147), (79, 261873), (81, 255407), (159, 130113), (183, 113049), (237, 87291), (477, 43371), (549, 37683), (711, 29097), (1431, 14457), (1647, 12561), (2133, 9699), (3233, 6399), (4187, 4941), (4293, 4819)]