21820981

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{3931}}^1$

素因数の和:4012

約数の個数: 16

約数和(自身を含む): 27303808

約数和(自身を除く): 5482827

約数列:

[1, 7, 13, 61, 91, 427, 793, 3931, 5551, 27517, 51103, 239791, 357721, 1678537, 3117283, 21820981]

約数ペア:

[(1, 21820981), (7, 3117283), (13, 1678537), (61, 357721), (91, 239791), (427, 51103), (793, 27517), (3931, 5551)]