21781821

素因数分解:

$3^1\times {\mathrm{47}}^1\times {\mathrm{241}}^1\times {\mathrm{641}}^1$

素因数の和:932

約数の個数: 16

約数和(自身を含む): 29829888

約数和(自身を除く): 8048067

約数列:

[1, 3, 47, 141, 241, 641, 723, 1923, 11327, 30127, 33981, 90381, 154481, 463443, 7260607, 21781821]

約数ペア:

[(1, 21781821), (3, 7260607), (47, 463443), (141, 154481), (241, 90381), (641, 33981), (723, 30127), (1923, 11327)]