21287924

素因数分解:

$2^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{17681}}^1$

素因数の和:17735

約数の個数: 24

約数和(自身を含む): 43568448

約数和(自身を除く): 22280524

約数列:

[1, 2, 4, 7, 14, 28, 43, 86, 172, 301, 602, 1204, 17681, 35362, 70724, 123767, 247534, 495068, 760283, 1520566, 3041132, 5321981, 10643962, 21287924]

約数ペア:

[(1, 21287924), (2, 10643962), (4, 5321981), (7, 3041132), (14, 1520566), (28, 760283), (43, 495068), (86, 247534), (172, 123767), (301, 70724), (602, 35362), (1204, 17681)]