20709280

素因数分解:

$2^5\times 5^1\times {\mathrm{71}}^1\times {\mathrm{1823}}^1$

素因数の和:1909

約数の個数: 48

約数和(自身を含む): 49641984

約数和(自身を除く): 28932704

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 71, 80, 142, 160, 284, 355, 568, 710, 1136, 1420, 1823, 2272, 2840, 3646, 5680, 7292, 9115, 11360, 14584, 18230, 29168, 36460, 58336, 72920, 129433, 145840, 258866, 291680, 517732, 647165, 1035464, 1294330, 2070928, 2588660, 4141856, 5177320, 10354640, 20709280]

約数ペア:

[(1, 20709280), (2, 10354640), (4, 5177320), (5, 4141856), (8, 2588660), (10, 2070928), (16, 1294330), (20, 1035464), (32, 647165), (40, 517732), (71, 291680), (80, 258866), (142, 145840), (160, 129433), (284, 72920), (355, 58336), (568, 36460), (710, 29168), (1136, 18230), (1420, 14584), (1823, 11360), (2272, 9115), (2840, 7292), (3646, 5680)]