21191085

素因数分解:

$3^3\times 5^1\times {\mathrm{156971}}^1$

素因数の和:156985

約数の個数: 16

約数和(自身を含む): 37673280

約数和(自身を除く): 16482195

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 156971, 470913, 784855, 1412739, 2354565, 4238217, 7063695, 21191085]

約数ペア:

[(1, 21191085), (3, 7063695), (5, 4238217), (9, 2354565), (15, 1412739), (27, 784855), (45, 470913), (135, 156971)]