18978087

素因数分解:

$3^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1\times {\mathrm{641}}^1$

素因数の和:854

約数の個数: 16

約数和(自身を含む): 25885440

約数和(自身を除く): 6907353

約数列:

[1, 3, 71, 139, 213, 417, 641, 1923, 9869, 29607, 45511, 89099, 136533, 267297, 6326029, 18978087]

約数ペア:

[(1, 18978087), (3, 6326029), (71, 267297), (139, 136533), (213, 89099), (417, 45511), (641, 29607), (1923, 9869)]