18978869

素因数分解:

$7^1\times {\mathrm{13}}^2\times {\mathrm{61}}^1\times {\mathrm{263}}^1$

素因数の和:357

約数の個数: 24

約数和(自身を含む): 23962752

約数和(自身を除く): 4983883

約数列:

[1, 7, 13, 61, 91, 169, 263, 427, 793, 1183, 1841, 3419, 5551, 10309, 16043, 23933, 44447, 72163, 112301, 208559, 311129, 1459913, 2711267, 18978869]

約数ペア:

[(1, 18978869), (7, 2711267), (13, 1459913), (61, 311129), (91, 208559), (169, 112301), (263, 72163), (427, 44447), (793, 23933), (1183, 16043), (1841, 10309), (3419, 5551)]