640804820

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{83}}^1\times {\mathrm{5437}}^1$

素因数の和:5600

約数の個数: 48

約数和(自身を含む): 1381339008

約数和(自身を除く): 740534188

約数列:

[1, 2, 4, 5, 10, 20, 71, 83, 142, 166, 284, 332, 355, 415, 710, 830, 1420, 1660, 5437, 5893, 10874, 11786, 21748, 23572, 27185, 29465, 54370, 58930, 108740, 117860, 386027, 451271, 772054, 902542, 1544108, 1805084, 1930135, 2256355, 3860270, 4512710, 7720540, 9025420, 32040241, 64080482, 128160964, 160201205, 320402410, 640804820]

約数ペア:

[(1, 640804820), (2, 320402410), (4, 160201205), (5, 128160964), (10, 64080482), (20, 32040241), (71, 9025420), (83, 7720540), (142, 4512710), (166, 3860270), (284, 2256355), (332, 1930135), (355, 1805084), (415, 1544108), (710, 902542), (830, 772054), (1420, 451271), (1660, 386027), (5437, 117860), (5893, 108740), (10874, 58930), (11786, 54370), (21748, 29465), (23572, 27185)]