21861515

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{3779}}^1$

素因数の和:3886

約数の個数: 16

約数和(自身を含む): 28576800

約数和(自身を除く): 6715285

約数列:

[1, 5, 13, 65, 89, 445, 1157, 3779, 5785, 18895, 49127, 245635, 336331, 1681655, 4372303, 21861515]

約数ペア:

[(1, 21861515), (5, 4372303), (13, 1681655), (65, 336331), (89, 245635), (445, 49127), (1157, 18895), (3779, 5785)]