19913999

素因数分解:

$7^1\times {\mathrm{61}}^1\times {\mathrm{149}}^1\times {\mathrm{313}}^1$

素因数の和:530

約数の個数: 16

約数和(自身を含む): 23361600

約数和(自身を除く): 3447601

約数列:

[1, 7, 61, 149, 313, 427, 1043, 2191, 9089, 19093, 46637, 63623, 133651, 326459, 2844857, 19913999]

約数ペア:

[(1, 19913999), (7, 2844857), (61, 326459), (149, 133651), (313, 63623), (427, 46637), (1043, 19093), (2191, 9089)]