20564440

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{557}}^1$

素因数の和:652

約数の個数: 64

約数和(自身を含む): 50621760

約数和(自身を除く): 30057320

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 71, 104, 130, 142, 260, 284, 355, 520, 557, 568, 710, 923, 1114, 1420, 1846, 2228, 2785, 2840, 3692, 4456, 4615, 5570, 7241, 7384, 9230, 11140, 14482, 18460, 22280, 28964, 36205, 36920, 39547, 57928, 72410, 79094, 144820, 158188, 197735, 289640, 316376, 395470, 514111, 790940, 1028222, 1581880, 2056444, 2570555, 4112888, 5141110, 10282220, 20564440]

約数ペア:

[(1, 20564440), (2, 10282220), (4, 5141110), (5, 4112888), (8, 2570555), (10, 2056444), (13, 1581880), (20, 1028222), (26, 790940), (40, 514111), (52, 395470), (65, 316376), (71, 289640), (104, 197735), (130, 158188), (142, 144820), (260, 79094), (284, 72410), (355, 57928), (520, 39547), (557, 36920), (568, 36205), (710, 28964), (923, 22280), (1114, 18460), (1420, 14482), (1846, 11140), (2228, 9230), (2785, 7384), (2840, 7241), (3692, 5570), (4456, 4615)]