21087021

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{17977}}^1$

素因数の和:18020

約数の個数: 16

約数和(自身を含む): 31065984

約数和(自身を除く): 9978963

約数列:

[1, 3, 17, 23, 51, 69, 391, 1173, 17977, 53931, 305609, 413471, 916827, 1240413, 7029007, 21087021]

約数ペア:

[(1, 21087021), (3, 7029007), (17, 1240413), (23, 916827), (51, 413471), (69, 305609), (391, 53931), (1173, 17977)]