19871990

素因数分解:

$2^1\times 5^1\times {\mathrm{181}}^1\times {\mathrm{10979}}^1$

素因数の和:11167

約数の個数: 16

約数和(自身を含む): 35970480

約数和(自身を除く): 16098490

約数列:

[1, 2, 5, 10, 181, 362, 905, 1810, 10979, 21958, 54895, 109790, 1987199, 3974398, 9935995, 19871990]

約数ペア:

[(1, 19871990), (2, 9935995), (5, 3974398), (10, 1987199), (181, 109790), (362, 54895), (905, 21958), (1810, 10979)]