21000895496

素因数分解:

$2^3\times 7^2\times {\mathrm{137}}^1\times {\mathrm{391049}}^1$

素因数の和:391206

約数の個数: 48

約数和(自身を含む): 46139989500

約数和(自身を除く): 25139094004

約数列:

[1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 137, 196, 274, 392, 548, 959, 1096, 1918, 3836, 6713, 7672, 13426, 26852, 53704, 391049, 782098, 1564196, 2737343, 3128392, 5474686, 10949372, 19161401, 21898744, 38322802, 53573713, 76645604, 107147426, 153291208, 214294852, 375015991, 428589704, 750031982, 1500063964, 2625111937, 3000127928, 5250223874, 10500447748, 21000895496]

約数ペア:

[(1, 21000895496), (2, 10500447748), (4, 5250223874), (7, 3000127928), (8, 2625111937), (14, 1500063964), (28, 750031982), (49, 428589704), (56, 375015991), (98, 214294852), (137, 153291208), (196, 107147426), (274, 76645604), (392, 53573713), (548, 38322802), (959, 21898744), (1096, 19161401), (1918, 10949372), (3836, 5474686), (6713, 3128392), (7672, 2737343), (13426, 1564196), (26852, 782098), (53704, 391049)]