20890000

素因数分解:

$2^4\times 5^4\times {\mathrm{2089}}^1$

素因数の和:2117

約数の個数: 50

約数和(自身を含む): 50600990

約数和(自身を除く): 29710990

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 625, 1000, 1250, 2000, 2089, 2500, 4178, 5000, 8356, 10000, 10445, 16712, 20890, 33424, 41780, 52225, 83560, 104450, 167120, 208900, 261125, 417800, 522250, 835600, 1044500, 1305625, 2089000, 2611250, 4178000, 5222500, 10445000, 20890000]

約数ペア:

[(1, 20890000), (2, 10445000), (4, 5222500), (5, 4178000), (8, 2611250), (10, 2089000), (16, 1305625), (20, 1044500), (25, 835600), (40, 522250), (50, 417800), (80, 261125), (100, 208900), (125, 167120), (200, 104450), (250, 83560), (400, 52225), (500, 41780), (625, 33424), (1000, 20890), (1250, 16712), (2000, 10445), (2089, 10000), (2500, 8356), (4178, 5000)]