19728121

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{229}}^1\times {\mathrm{397}}^1$

素因数の和:664

約数の個数: 16

約数和(自身を含む): 23434240

約数和(自身を除く): 3706119

約数列:

[1, 7, 31, 217, 229, 397, 1603, 2779, 7099, 12307, 49693, 86149, 90913, 636391, 2818303, 19728121]

約数ペア:

[(1, 19728121), (7, 2818303), (31, 636391), (217, 90913), (229, 86149), (397, 49693), (1603, 12307), (2779, 7099)]