21981759

素因数分解:

$3^1\times {\mathrm{31}}^1\times {\mathrm{47}}^2\times {\mathrm{107}}^1$

素因数の和:235

約数の個数: 24

約数和(自身を含む): 31200768

約数和(自身を除く): 9219009

約数列:

[1, 3, 31, 47, 93, 107, 141, 321, 1457, 2209, 3317, 4371, 5029, 6627, 9951, 15087, 68479, 155899, 205437, 236363, 467697, 709089, 7327253, 21981759]

約数ペア:

[(1, 21981759), (3, 7327253), (31, 709089), (47, 467697), (93, 236363), (107, 205437), (141, 155899), (321, 68479), (1457, 15087), (2209, 9951), (3317, 6627), (4371, 5029)]