21981260

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{197}}^1\times {\mathrm{797}}^1$

素因数の和:1010

約数の個数: 48

約数和(自身を含む): 53089344

約数和(自身を除く): 31108084

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 197, 394, 788, 797, 985, 1379, 1594, 1970, 2758, 3188, 3940, 3985, 5516, 5579, 6895, 7970, 11158, 13790, 15940, 22316, 27580, 27895, 55790, 111580, 157009, 314018, 628036, 785045, 1099063, 1570090, 2198126, 3140180, 4396252, 5495315, 10990630, 21981260]

約数ペア:

[(1, 21981260), (2, 10990630), (4, 5495315), (5, 4396252), (7, 3140180), (10, 2198126), (14, 1570090), (20, 1099063), (28, 785045), (35, 628036), (70, 314018), (140, 157009), (197, 111580), (394, 55790), (788, 27895), (797, 27580), (985, 22316), (1379, 15940), (1594, 13790), (1970, 11158), (2758, 7970), (3188, 6895), (3940, 5579), (3985, 5516)]