21891440

素因数分解:

$2^4\times 5^1\times {\mathrm{273643}}^1$

素因数の和:273656

約数の個数: 20

約数和(自身を含む): 50897784

約数和(自身を除く): 29006344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 273643, 547286, 1094572, 1368215, 2189144, 2736430, 4378288, 5472860, 10945720, 21891440]

約数ペア:

[(1, 21891440), (2, 10945720), (4, 5472860), (5, 4378288), (8, 2736430), (10, 2189144), (16, 1368215), (20, 1094572), (40, 547286), (80, 273643)]