21891978

素因数分解:

$2^1\times 3^3\times {\mathrm{405407}}^1$

素因数の和:405418

約数の個数: 16

約数和(自身を含む): 48648960

約数和(自身を除く): 26756982

約数列:

[1, 2, 3, 6, 9, 18, 27, 54, 405407, 810814, 1216221, 2432442, 3648663, 7297326, 10945989, 21891978]

約数ペア:

[(1, 21891978), (2, 10945989), (3, 7297326), (6, 3648663), (9, 2432442), (18, 1216221), (27, 810814), (54, 405407)]