18919989

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{223}}^1\times {\mathrm{857}}^1$

素因数の和:1097

約数の個数: 24

約数和(自身を含む): 29981952

約数和(自身を除く): 11061963

約数列:

[1, 3, 9, 11, 33, 99, 223, 669, 857, 2007, 2453, 2571, 7359, 7713, 9427, 22077, 28281, 84843, 191111, 573333, 1719999, 2102221, 6306663, 18919989]

約数ペア:

[(1, 18919989), (3, 6306663), (9, 2102221), (11, 1719999), (33, 573333), (99, 191111), (223, 84843), (669, 28281), (857, 22077), (2007, 9427), (2453, 7713), (2571, 7359)]