19890125

素因数分解:

$5^3\times {\mathrm{41}}^1\times {\mathrm{3881}}^1$

素因数の和:3937

約数の個数: 16

約数和(自身を含む): 25434864

約数和(自身を除く): 5544739

約数列:

[1, 5, 25, 41, 125, 205, 1025, 3881, 5125, 19405, 97025, 159121, 485125, 795605, 3978025, 19890125]

約数ペア:

[(1, 19890125), (5, 3978025), (25, 795605), (41, 485125), (125, 159121), (205, 97025), (1025, 19405), (3881, 5125)]