21680217

素因数分解:

$3^5\times {\mathrm{13}}^1\times {\mathrm{6863}}^1$

素因数の和:6891

約数の個数: 24

約数和(自身を含む): 34978944

約数和(自身を除く): 13298727

約数列:

[1, 3, 9, 13, 27, 39, 81, 117, 243, 351, 1053, 3159, 6863, 20589, 61767, 89219, 185301, 267657, 555903, 802971, 1667709, 2408913, 7226739, 21680217]

約数ペア:

[(1, 21680217), (3, 7226739), (9, 2408913), (13, 1667709), (27, 802971), (39, 555903), (81, 267657), (117, 185301), (243, 89219), (351, 61767), (1053, 20589), (3159, 6863)]