19900045

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{181}}^1\times {\mathrm{1999}}^1$

素因数の和:2196

約数の個数: 16

約数和(自身を含む): 26208000

約数和(自身を除く): 6307955

約数列:

[1, 5, 11, 55, 181, 905, 1991, 1999, 9955, 9995, 21989, 109945, 361819, 1809095, 3980009, 19900045]

約数ペア:

[(1, 19900045), (5, 3980009), (11, 1809095), (55, 361819), (181, 109945), (905, 21989), (1991, 9995), (1999, 9955)]