18905000

素因数分解:

$2^3\times 5^4\times {\mathrm{19}}^1\times {\mathrm{199}}^1$

素因数の和:244

約数の個数: 80

約数和(自身を含む): 46860000

約数和(自身を除く): 27955000

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 25, 38, 40, 50, 76, 95, 100, 125, 152, 190, 199, 200, 250, 380, 398, 475, 500, 625, 760, 796, 950, 995, 1000, 1250, 1592, 1900, 1990, 2375, 2500, 3781, 3800, 3980, 4750, 4975, 5000, 7562, 7960, 9500, 9950, 11875, 15124, 18905, 19000, 19900, 23750, 24875, 30248, 37810, 39800, 47500, 49750, 75620, 94525, 95000, 99500, 124375, 151240, 189050, 199000, 248750, 378100, 472625, 497500, 756200, 945250, 995000, 1890500, 2363125, 3781000, 4726250, 9452500, 18905000]

約数ペア:

[(1, 18905000), (2, 9452500), (4, 4726250), (5, 3781000), (8, 2363125), (10, 1890500), (19, 995000), (20, 945250), (25, 756200), (38, 497500), (40, 472625), (50, 378100), (76, 248750), (95, 199000), (100, 189050), (125, 151240), (152, 124375), (190, 99500), (199, 95000), (200, 94525), (250, 75620), (380, 49750), (398, 47500), (475, 39800), (500, 37810), (625, 30248), (760, 24875), (796, 23750), (950, 19900), (995, 19000), (1000, 18905), (1250, 15124), (1592, 11875), (1900, 9950), (1990, 9500), (2375, 7960), (2500, 7562), (3781, 5000), (3800, 4975), (3980, 4750)]