21390800

素因数分解:

$2^4\times 5^2\times {\mathrm{53}}^1\times {\mathrm{1009}}^1$

素因数の和:1080

約数の個数: 60

約数和(自身を含む): 52412940

約数和(自身を除く): 31022140

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 53, 80, 100, 106, 200, 212, 265, 400, 424, 530, 848, 1009, 1060, 1325, 2018, 2120, 2650, 4036, 4240, 5045, 5300, 8072, 10090, 10600, 16144, 20180, 21200, 25225, 40360, 50450, 53477, 80720, 100900, 106954, 201800, 213908, 267385, 403600, 427816, 534770, 855632, 1069540, 1336925, 2139080, 2673850, 4278160, 5347700, 10695400, 21390800]

約数ペア:

[(1, 21390800), (2, 10695400), (4, 5347700), (5, 4278160), (8, 2673850), (10, 2139080), (16, 1336925), (20, 1069540), (25, 855632), (40, 534770), (50, 427816), (53, 403600), (80, 267385), (100, 213908), (106, 201800), (200, 106954), (212, 100900), (265, 80720), (400, 53477), (424, 50450), (530, 40360), (848, 25225), (1009, 21200), (1060, 20180), (1325, 16144), (2018, 10600), (2120, 10090), (2650, 8072), (4036, 5300), (4240, 5045)]