21137500

素因数分解:

$2^2\times 5^5\times {\mathrm{19}}^1\times {\mathrm{89}}^1$

素因数の和:137

約数の個数: 72

約数和(自身を含む): 49215600

約数和(自身を除く): 28078100

約数列:

[1, 2, 4, 5, 10, 19, 20, 25, 38, 50, 76, 89, 95, 100, 125, 178, 190, 250, 356, 380, 445, 475, 500, 625, 890, 950, 1250, 1691, 1780, 1900, 2225, 2375, 2500, 3125, 3382, 4450, 4750, 6250, 6764, 8455, 8900, 9500, 11125, 11875, 12500, 16910, 22250, 23750, 33820, 42275, 44500, 47500, 55625, 59375, 84550, 111250, 118750, 169100, 211375, 222500, 237500, 278125, 422750, 556250, 845500, 1056875, 1112500, 2113750, 4227500, 5284375, 10568750, 21137500]

約数ペア:

[(1, 21137500), (2, 10568750), (4, 5284375), (5, 4227500), (10, 2113750), (19, 1112500), (20, 1056875), (25, 845500), (38, 556250), (50, 422750), (76, 278125), (89, 237500), (95, 222500), (100, 211375), (125, 169100), (178, 118750), (190, 111250), (250, 84550), (356, 59375), (380, 55625), (445, 47500), (475, 44500), (500, 42275), (625, 33820), (890, 23750), (950, 22250), (1250, 16910), (1691, 12500), (1780, 11875), (1900, 11125), (2225, 9500), (2375, 8900), (2500, 8455), (3125, 6764), (3382, 6250), (4450, 4750)]