19890065

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{9871}}^1$

素因数の和:9920

約数の個数: 16

約数和(自身を含む): 26535936

約数和(自身を除く): 6645871

約数列:

[1, 5, 13, 31, 65, 155, 403, 2015, 9871, 49355, 128323, 306001, 641615, 1530005, 3978013, 19890065]

約数ペア:

[(1, 19890065), (5, 3978013), (13, 1530005), (31, 641615), (65, 306001), (155, 128323), (403, 49355), (2015, 9871)]