1900000

素因数分解:

$2^5\times 5^5\times {\mathrm{19}}^1$

素因数の和:54

約数の個数: 72

約数和(自身を含む): 4921560

約数和(自身を除く): 3021560

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 25, 32, 38, 40, 50, 76, 80, 95, 100, 125, 152, 160, 190, 200, 250, 304, 380, 400, 475, 500, 608, 625, 760, 800, 950, 1000, 1250, 1520, 1900, 2000, 2375, 2500, 3040, 3125, 3800, 4000, 4750, 5000, 6250, 7600, 9500, 10000, 11875, 12500, 15200, 19000, 20000, 23750, 25000, 38000, 47500, 50000, 59375, 76000, 95000, 100000, 118750, 190000, 237500, 380000, 475000, 950000, 1900000]

約数ペア:

[(1, 1900000), (2, 950000), (4, 475000), (5, 380000), (8, 237500), (10, 190000), (16, 118750), (19, 100000), (20, 95000), (25, 76000), (32, 59375), (38, 50000), (40, 47500), (50, 38000), (76, 25000), (80, 23750), (95, 20000), (100, 19000), (125, 15200), (152, 12500), (160, 11875), (190, 10000), (200, 9500), (250, 7600), (304, 6250), (380, 5000), (400, 4750), (475, 4000), (500, 3800), (608, 3125), (625, 3040), (760, 2500), (800, 2375), (950, 2000), (1000, 1900), (1250, 1520)]