21405609

素因数分解:

$3^2\times {\mathrm{19}}^1\times {\mathrm{151}}^1\times {\mathrm{829}}^1$

素因数の和:1005

約数の個数: 24

約数和(自身を含む): 32801600

約数和(自身を除く): 11395991

約数列:

[1, 3, 9, 19, 57, 151, 171, 453, 829, 1359, 2487, 2869, 7461, 8607, 15751, 25821, 47253, 125179, 141759, 375537, 1126611, 2378401, 7135203, 21405609]

約数ペア:

[(1, 21405609), (3, 7135203), (9, 2378401), (19, 1126611), (57, 375537), (151, 141759), (171, 125179), (453, 47253), (829, 25821), (1359, 15751), (2487, 8607), (2869, 7461)]