19617905

素因数分解:

$5^1\times {\mathrm{61}}^1\times {\mathrm{131}}^1\times {\mathrm{491}}^1$

素因数の和:688

約数の個数: 16

約数和(自身を含む): 24159168

約数和(自身を除く): 4541263

約数列:

[1, 5, 61, 131, 305, 491, 655, 2455, 7991, 29951, 39955, 64321, 149755, 321605, 3923581, 19617905]

約数ペア:

[(1, 19617905), (5, 3923581), (61, 321605), (131, 149755), (305, 64321), (491, 39955), (655, 29951), (2455, 7991)]