20396080

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2339}}^1$

素因数の和:2461

約数の個数: 40

約数和(自身を含む): 47876400

約数和(自身を除く): 27480320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 2339, 4360, 4678, 8720, 9356, 11695, 18712, 23390, 37424, 46780, 93560, 187120, 254951, 509902, 1019804, 1274755, 2039608, 2549510, 4079216, 5099020, 10198040, 20396080]

約数ペア:

[(1, 20396080), (2, 10198040), (4, 5099020), (5, 4079216), (8, 2549510), (10, 2039608), (16, 1274755), (20, 1019804), (40, 509902), (80, 254951), (109, 187120), (218, 93560), (436, 46780), (545, 37424), (872, 23390), (1090, 18712), (1744, 11695), (2180, 9356), (2339, 8720), (4360, 4678)]