21687345

素因数分解:

$3^4\times 5^1\times {\mathrm{53549}}^1$

素因数の和:53566

約数の個数: 20

約数和(自身を含む): 38877300

約数和(自身を除く): 17189955

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 53549, 160647, 267745, 481941, 803235, 1445823, 2409705, 4337469, 7229115, 21687345]

約数ペア:

[(1, 21687345), (3, 7229115), (5, 4337469), (9, 2409705), (15, 1445823), (27, 803235), (45, 481941), (81, 267745), (135, 160647), (405, 53549)]