643972

素因数分解:

$2^2\times 7^1\times {\mathrm{109}}^1\times {\mathrm{211}}^1$

素因数の和:331

約数の個数: 24

約数和(自身を含む): 1305920

約数和(自身を除く): 661948

約数列:

[1, 2, 4, 7, 14, 28, 109, 211, 218, 422, 436, 763, 844, 1477, 1526, 2954, 3052, 5908, 22999, 45998, 91996, 160993, 321986, 643972]

約数ペア:

[(1, 643972), (2, 321986), (4, 160993), (7, 91996), (14, 45998), (28, 22999), (109, 5908), (211, 3052), (218, 2954), (422, 1526), (436, 1477), (763, 844)]