21047605

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{251}}^1\times {\mathrm{541}}^1$

素因数の和:828

約数の個数: 16

約数和(自身を含む): 26224128

約数和(自身を除く): 5176523

約数列:

[1, 5, 31, 155, 251, 541, 1255, 2705, 7781, 16771, 38905, 83855, 135791, 678955, 4209521, 21047605]

約数ペア:

[(1, 21047605), (5, 4209521), (31, 678955), (155, 135791), (251, 83855), (541, 38905), (1255, 16771), (2705, 7781)]