21301947

素因数分解:

$3^4\times {\mathrm{409}}^1\times {\mathrm{643}}^1$

素因数の和:1064

約数の個数: 20

約数和(自身を含む): 31948840

約数和(自身を除く): 10646893

約数列:

[1, 3, 9, 27, 81, 409, 643, 1227, 1929, 3681, 5787, 11043, 17361, 33129, 52083, 262987, 788961, 2366883, 7100649, 21301947]

約数ペア:

[(1, 21301947), (3, 7100649), (9, 2366883), (27, 788961), (81, 262987), (409, 52083), (643, 33129), (1227, 17361), (1929, 11043), (3681, 5787)]