21565740

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{51347}}^1$

素因数の和:51366

約数の個数: 48

約数和(自身を含む): 69011712

約数和(自身を除く): 47445972

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 51347, 102694, 154041, 205388, 256735, 308082, 359429, 513470, 616164, 718858, 770205, 1026940, 1078287, 1437716, 1540410, 1797145, 2156574, 3080820, 3594290, 4313148, 5391435, 7188580, 10782870, 21565740]

約数ペア:

[(1, 21565740), (2, 10782870), (3, 7188580), (4, 5391435), (5, 4313148), (6, 3594290), (7, 3080820), (10, 2156574), (12, 1797145), (14, 1540410), (15, 1437716), (20, 1078287), (21, 1026940), (28, 770205), (30, 718858), (35, 616164), (42, 513470), (60, 359429), (70, 308082), (84, 256735), (105, 205388), (140, 154041), (210, 102694), (420, 51347)]