20759440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19961}}^1$

素因数の和:19987

約数の個数: 40

約数和(自身を含む): 51981048

約数和(自身を除く): 31221608

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19961, 39922, 79844, 99805, 159688, 199610, 259493, 319376, 399220, 518986, 798440, 1037972, 1297465, 1596880, 2075944, 2594930, 4151888, 5189860, 10379720, 20759440]

約数ペア:

[(1, 20759440), (2, 10379720), (4, 5189860), (5, 4151888), (8, 2594930), (10, 2075944), (13, 1596880), (16, 1297465), (20, 1037972), (26, 798440), (40, 518986), (52, 399220), (65, 319376), (80, 259493), (104, 199610), (130, 159688), (208, 99805), (260, 79844), (520, 39922), (1040, 19961)]