18859990

素因数分解:

$2^1\times 5^1\times {\mathrm{89}}^1\times {\mathrm{21191}}^1$

素因数の和:21287

約数の個数: 16

約数和(自身を含む): 34331040

約数和(自身を除く): 15471050

約数列:

[1, 2, 5, 10, 89, 178, 445, 890, 21191, 42382, 105955, 211910, 1885999, 3771998, 9429995, 18859990]

約数ペア:

[(1, 18859990), (2, 9429995), (5, 3771998), (10, 1885999), (89, 211910), (178, 105955), (445, 42382), (890, 21191)]