18690890

素因数分解:

$2^1\times 5^1\times {\mathrm{89}}^1\times {\mathrm{21001}}^1$

素因数の和:21097

約数の個数: 16

約数和(自身を含む): 34023240

約数和(自身を除く): 15332350

約数列:

[1, 2, 5, 10, 89, 178, 445, 890, 21001, 42002, 105005, 210010, 1869089, 3738178, 9345445, 18690890]

約数ペア:

[(1, 18690890), (2, 9345445), (5, 3738178), (10, 1869089), (89, 210010), (178, 105005), (445, 42002), (890, 21001)]