21791920

素因数分解:

$2^4\times 5^1\times {\mathrm{272399}}^1$

素因数の和:272412

約数の個数: 20

約数和(自身を含む): 50666400

約数和(自身を除く): 28874480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 272399, 544798, 1089596, 1361995, 2179192, 2723990, 4358384, 5447980, 10895960, 21791920]

約数ペア:

[(1, 21791920), (2, 10895960), (4, 5447980), (5, 4358384), (8, 2723990), (10, 2179192), (16, 1361995), (20, 1089596), (40, 544798), (80, 272399)]