21291880

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12379}}^1$

素因数の和:12433

約数の個数: 32

約数和(自身を含む): 49024800

約数和(自身を除く): 27732920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12379, 24758, 49516, 61895, 99032, 123790, 247580, 495160, 532297, 1064594, 2129188, 2661485, 4258376, 5322970, 10645940, 21291880]

約数ペア:

[(1, 21291880), (2, 10645940), (4, 5322970), (5, 4258376), (8, 2661485), (10, 2129188), (20, 1064594), (40, 532297), (43, 495160), (86, 247580), (172, 123790), (215, 99032), (344, 61895), (430, 49516), (860, 24758), (1720, 12379)]