21687021

素因数分解:

$3^6\times {\mathrm{71}}^1\times {\mathrm{419}}^1$

素因数の和:508

約数の個数: 28

約数和(自身を含む): 33052320

約数和(自身を除く): 11365299

約数列:

[1, 3, 9, 27, 71, 81, 213, 243, 419, 639, 729, 1257, 1917, 3771, 5751, 11313, 17253, 29749, 33939, 51759, 89247, 101817, 267741, 305451, 803223, 2409669, 7229007, 21687021]

約数ペア:

[(1, 21687021), (3, 7229007), (9, 2409669), (27, 803223), (71, 305451), (81, 267741), (213, 101817), (243, 89247), (419, 51759), (639, 33939), (729, 29749), (1257, 17253), (1917, 11313), (3771, 5751)]