21000688250

素因数分解:

$2^1\times 5^3\times {\mathrm{127}}^1\times {\mathrm{661439}}^1$

素因数の和:661583

約数の個数: 32

約数和(自身を含む): 39622901760

約数和(自身を除く): 18622213510

約数列:

[1, 2, 5, 10, 25, 50, 125, 127, 250, 254, 635, 1270, 3175, 6350, 15875, 31750, 661439, 1322878, 3307195, 6614390, 16535975, 33071950, 82679875, 84002753, 165359750, 168005506, 420013765, 840027530, 2100068825, 4200137650, 10500344125, 21000688250]

約数ペア:

[(1, 21000688250), (2, 10500344125), (5, 4200137650), (10, 2100068825), (25, 840027530), (50, 420013765), (125, 168005506), (127, 165359750), (250, 84002753), (254, 82679875), (635, 33071950), (1270, 16535975), (3175, 6614390), (6350, 3307195), (15875, 1322878), (31750, 661439)]