20320209

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{577}}^1$

素因数の和:646

約数の個数: 48

約数和(自身を含む): 37028992

約数和(自身を除く): 16708783

約数列:

[1, 3, 7, 9, 13, 21, 39, 43, 63, 91, 117, 129, 273, 301, 387, 559, 577, 819, 903, 1677, 1731, 2709, 3913, 4039, 5031, 5193, 7501, 11739, 12117, 22503, 24811, 35217, 36351, 52507, 67509, 74433, 157521, 173677, 223299, 322543, 472563, 521031, 967629, 1563093, 2257801, 2902887, 6773403, 20320209]

約数ペア:

[(1, 20320209), (3, 6773403), (7, 2902887), (9, 2257801), (13, 1563093), (21, 967629), (39, 521031), (43, 472563), (63, 322543), (91, 223299), (117, 173677), (129, 157521), (273, 74433), (301, 67509), (387, 52507), (559, 36351), (577, 35217), (819, 24811), (903, 22503), (1677, 12117), (1731, 11739), (2709, 7501), (3913, 5193), (4039, 5031)]