21005000

素因数分解:

$2^3\times 5^4\times {\mathrm{4201}}^1$

素因数の和:4227

約数の個数: 40

約数和(自身を含む): 49226430

約数和(自身を除く): 28221430

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 625, 1000, 1250, 2500, 4201, 5000, 8402, 16804, 21005, 33608, 42010, 84020, 105025, 168040, 210050, 420100, 525125, 840200, 1050250, 2100500, 2625625, 4201000, 5251250, 10502500, 21005000]

約数ペア:

[(1, 21005000), (2, 10502500), (4, 5251250), (5, 4201000), (8, 2625625), (10, 2100500), (20, 1050250), (25, 840200), (40, 525125), (50, 420100), (100, 210050), (125, 168040), (200, 105025), (250, 84020), (500, 42010), (625, 33608), (1000, 21005), (1250, 16804), (2500, 8402), (4201, 5000)]