19910905

素因数分解:

$5^1\times 7^2\times {\mathrm{181}}^1\times {\mathrm{449}}^1$

素因数の和:649

約数の個数: 24

約数和(自身を含む): 28009800

約数和(自身を除く): 8098895

約数列:

[1, 5, 7, 35, 49, 181, 245, 449, 905, 1267, 2245, 3143, 6335, 8869, 15715, 22001, 44345, 81269, 110005, 406345, 568883, 2844415, 3982181, 19910905]

約数ペア:

[(1, 19910905), (5, 3982181), (7, 2844415), (35, 568883), (49, 406345), (181, 110005), (245, 81269), (449, 44345), (905, 22001), (1267, 15715), (2245, 8869), (3143, 6335)]