278300780

素因数分解:

$2^2\times 5^1\times {\mathrm{1999}}^1\times {\mathrm{6961}}^1$

素因数の和:8969

約数の個数: 24

約数和(自身を含む): 584808000

約数和(自身を除く): 306507220

約数列:

[1, 2, 4, 5, 10, 20, 1999, 3998, 6961, 7996, 9995, 13922, 19990, 27844, 34805, 39980, 69610, 139220, 13915039, 27830078, 55660156, 69575195, 139150390, 278300780]

約数ペア:

[(1, 278300780), (2, 139150390), (4, 69575195), (5, 55660156), (10, 27830078), (20, 13915039), (1999, 139220), (3998, 69610), (6961, 39980), (7996, 34805), (9995, 27844), (13922, 19990)]