20561905

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{45191}}^1$

素因数の和:45216

約数の個数: 16

約数和(自身を含む): 30369024

約数和(自身を除く): 9807119

約数列:

[1, 5, 7, 13, 35, 65, 91, 455, 45191, 225955, 316337, 587483, 1581685, 2937415, 4112381, 20561905]

約数ペア:

[(1, 20561905), (5, 4112381), (7, 2937415), (13, 1581685), (35, 587483), (65, 316337), (91, 225955), (455, 45191)]