21780765

素因数分解:

$3^3\times 5^1\times {\mathrm{161339}}^1$

素因数の和:161353

約数の個数: 16

約数和(自身を含む): 38721600

約数和(自身を除く): 16940835

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 161339, 484017, 806695, 1452051, 2420085, 4356153, 7260255, 21780765]

約数ペア:

[(1, 21780765), (3, 7260255), (5, 4356153), (9, 2420085), (15, 1452051), (27, 806695), (45, 484017), (135, 161339)]