21000500

素因数分解:

$2^2\times 5^3\times {\mathrm{97}}^1\times {\mathrm{433}}^1$

素因数の和:549

約数の個数: 48

約数和(自身を含む): 46444944

約数和(自身を除く): 25444444

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 97, 100, 125, 194, 250, 388, 433, 485, 500, 866, 970, 1732, 1940, 2165, 2425, 4330, 4850, 8660, 9700, 10825, 12125, 21650, 24250, 42001, 43300, 48500, 54125, 84002, 108250, 168004, 210005, 216500, 420010, 840020, 1050025, 2100050, 4200100, 5250125, 10500250, 21000500]

約数ペア:

[(1, 21000500), (2, 10500250), (4, 5250125), (5, 4200100), (10, 2100050), (20, 1050025), (25, 840020), (50, 420010), (97, 216500), (100, 210005), (125, 168004), (194, 108250), (250, 84002), (388, 54125), (433, 48500), (485, 43300), (500, 42001), (866, 24250), (970, 21650), (1732, 12125), (1940, 10825), (2165, 9700), (2425, 8660), (4330, 4850)]