20781145

素因数分解:

$5^1\times 7^2\times {\mathrm{11}}^2\times {\mathrm{701}}^1$

素因数の和:742

約数の個数: 36

約数和(自身を含む): 31931172

約数和(自身を除く): 11150027

約数列:

[1, 5, 7, 11, 35, 49, 55, 77, 121, 245, 385, 539, 605, 701, 847, 2695, 3505, 4235, 4907, 5929, 7711, 24535, 29645, 34349, 38555, 53977, 84821, 171745, 269885, 377839, 424105, 593747, 1889195, 2968735, 4156229, 20781145]

約数ペア:

[(1, 20781145), (5, 4156229), (7, 2968735), (11, 1889195), (35, 593747), (49, 424105), (55, 377839), (77, 269885), (121, 171745), (245, 84821), (385, 53977), (539, 38555), (605, 34349), (701, 29645), (847, 24535), (2695, 7711), (3505, 5929), (4235, 4907)]