18720779

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{6571}}^1$

素因数の和:6626

約数の個数: 16

約数和(自身を含む): 23974656

約数和(自身を除く): 5253877

約数列:

[1, 7, 11, 37, 77, 259, 407, 2849, 6571, 45997, 72281, 243127, 505967, 1701889, 2674397, 18720779]

約数ペア:

[(1, 18720779), (7, 2674397), (11, 1701889), (37, 505967), (77, 243127), (259, 72281), (407, 45997), (2849, 6571)]