1780000

素因数分解:

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

素因数の和:119

約数の個数: 60

約数和(自身を含む): 4428270

約数和(自身を除く): 2648270

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 89, 100, 125, 160, 178, 200, 250, 356, 400, 445, 500, 625, 712, 800, 890, 1000, 1250, 1424, 1780, 2000, 2225, 2500, 2848, 3560, 4000, 4450, 5000, 7120, 8900, 10000, 11125, 14240, 17800, 20000, 22250, 35600, 44500, 55625, 71200, 89000, 111250, 178000, 222500, 356000, 445000, 890000, 1780000]

約数ペア:

[(1, 1780000), (2, 890000), (4, 445000), (5, 356000), (8, 222500), (10, 178000), (16, 111250), (20, 89000), (25, 71200), (32, 55625), (40, 44500), (50, 35600), (80, 22250), (89, 20000), (100, 17800), (125, 14240), (160, 11125), (178, 10000), (200, 8900), (250, 7120), (356, 5000), (400, 4450), (445, 4000), (500, 3560), (625, 2848), (712, 2500), (800, 2225), (890, 2000), (1000, 1780), (1250, 1424)]