20985795

素因数分解:

$3^2\times 5^1\times {\mathrm{113}}^1\times {\mathrm{4127}}^1$

素因数の和:4251

約数の個数: 24

約数和(自身を含む): 36706176

約数和(自身を除く): 15720381

約数列:

[1, 3, 5, 9, 15, 45, 113, 339, 565, 1017, 1695, 4127, 5085, 12381, 20635, 37143, 61905, 185715, 466351, 1399053, 2331755, 4197159, 6995265, 20985795]

約数ペア:

[(1, 20985795), (3, 6995265), (5, 4197159), (9, 2331755), (15, 1399053), (45, 466351), (113, 185715), (339, 61905), (565, 37143), (1017, 20635), (1695, 12381), (4127, 5085)]