21905065

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1553}}^1$

素因数の和:1609

約数の個数: 32

約数和(自身を含む): 33417216

約数和(自身を除く): 11512151

約数列:

[1, 5, 7, 13, 31, 35, 65, 91, 155, 217, 403, 455, 1085, 1553, 2015, 2821, 7765, 10871, 14105, 20189, 48143, 54355, 100945, 141323, 240715, 337001, 625859, 706615, 1685005, 3129295, 4381013, 21905065]

約数ペア:

[(1, 21905065), (5, 4381013), (7, 3129295), (13, 1685005), (31, 706615), (35, 625859), (65, 337001), (91, 240715), (155, 141323), (217, 100945), (403, 54355), (455, 48143), (1085, 20189), (1553, 14105), (2015, 10871), (2821, 7765)]