21298815

素因数分解:

$3^3\times 5^1\times {\mathrm{157769}}^1$

素因数の和:157783

約数の個数: 16

約数和(自身を含む): 37864800

約数和(自身を除く): 16565985

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 157769, 473307, 788845, 1419921, 2366535, 4259763, 7099605, 21298815]

約数ペア:

[(1, 21298815), (3, 7099605), (5, 4259763), (9, 2366535), (15, 1419921), (27, 788845), (45, 473307), (135, 157769)]