21581781

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{5479}}^1$

素因数の和:5596

約数の個数: 16

約数和(自身を含む): 31301760

約数和(自身を除く): 9719979

約数列:

[1, 3, 13, 39, 101, 303, 1313, 3939, 5479, 16437, 71227, 213681, 553379, 1660137, 7193927, 21581781]

約数ペア:

[(1, 21581781), (3, 7193927), (13, 1660137), (39, 553379), (101, 213681), (303, 71227), (1313, 16437), (3939, 5479)]