19810205

素因数分解:

$5^1\times {\mathrm{109}}^1\times {\mathrm{163}}^1\times {\mathrm{223}}^1$

素因数の和:500

約数の個数: 16

約数和(自身を含む): 24245760

約数和(自身を除く): 4435555

約数列:

[1, 5, 109, 163, 223, 545, 815, 1115, 17767, 24307, 36349, 88835, 121535, 181745, 3962041, 19810205]

約数ペア:

[(1, 19810205), (5, 3962041), (109, 181745), (163, 121535), (223, 88835), (545, 36349), (815, 24307), (1115, 17767)]