21119615

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{151}}^1\times {\mathrm{2543}}^1$

素因数の和:2710

約数の個数: 16

約数和(自身を含む): 27841536

約数和(自身を除く): 6721921

約数列:

[1, 5, 11, 55, 151, 755, 1661, 2543, 8305, 12715, 27973, 139865, 383993, 1919965, 4223923, 21119615]

約数ペア:

[(1, 21119615), (5, 4223923), (11, 1919965), (55, 383993), (151, 139865), (755, 27973), (1661, 12715), (2543, 8305)]