18888890

素因数分解:

$2^1\times 5^1\times {\mathrm{131}}^1\times {\mathrm{14419}}^1$

素因数の和:14557

約数の個数: 16

約数和(自身を含む): 34261920

約数和(自身を除く): 15373030

約数列:

[1, 2, 5, 10, 131, 262, 655, 1310, 14419, 28838, 72095, 144190, 1888889, 3777778, 9444445, 18888890]

約数ペア:

[(1, 18888890), (2, 9444445), (5, 3777778), (10, 1888889), (131, 144190), (262, 72095), (655, 28838), (1310, 14419)]