12721640

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^2\times {\mathrm{881}}^1$

素因数の和:930

約数の個数: 48

約数和(自身を含む): 30243780

約数和(自身を除く): 17522140

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 152, 190, 361, 380, 722, 760, 881, 1444, 1762, 1805, 2888, 3524, 3610, 4405, 7048, 7220, 8810, 14440, 16739, 17620, 33478, 35240, 66956, 83695, 133912, 167390, 318041, 334780, 636082, 669560, 1272164, 1590205, 2544328, 3180410, 6360820, 12721640]

約数ペア:

[(1, 12721640), (2, 6360820), (4, 3180410), (5, 2544328), (8, 1590205), (10, 1272164), (19, 669560), (20, 636082), (38, 334780), (40, 318041), (76, 167390), (95, 133912), (152, 83695), (190, 66956), (361, 35240), (380, 33478), (722, 17620), (760, 16739), (881, 14440), (1444, 8810), (1762, 7220), (1805, 7048), (2888, 4405), (3524, 3610)]