890000

素因数分解:

$2^4\times 5^4\times {\mathrm{89}}^1$

素因数の和:117

約数の個数: 50

約数和(自身を含む): 2178990

約数和(自身を除く): 1288990

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 89, 100, 125, 178, 200, 250, 356, 400, 445, 500, 625, 712, 890, 1000, 1250, 1424, 1780, 2000, 2225, 2500, 3560, 4450, 5000, 7120, 8900, 10000, 11125, 17800, 22250, 35600, 44500, 55625, 89000, 111250, 178000, 222500, 445000, 890000]

約数ペア:

[(1, 890000), (2, 445000), (4, 222500), (5, 178000), (8, 111250), (10, 89000), (16, 55625), (20, 44500), (25, 35600), (40, 22250), (50, 17800), (80, 11125), (89, 10000), (100, 8900), (125, 7120), (178, 5000), (200, 4450), (250, 3560), (356, 2500), (400, 2225), (445, 2000), (500, 1780), (625, 1424), (712, 1250), (890, 1000)]