20390865

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{123581}}^1$

素因数の和:123600

約数の個数: 16

約数和(自身を含む): 35591616

約数和(自身を除く): 15200751

約数列:

[1, 3, 5, 11, 15, 33, 55, 165, 123581, 370743, 617905, 1359391, 1853715, 4078173, 6796955, 20390865]

約数ペア:

[(1, 20390865), (3, 6796955), (5, 4078173), (11, 1853715), (15, 1359391), (33, 617905), (55, 370743), (165, 123581)]