20919440

素因数分解:

$2^4\times 5^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{127}}^1$

素因数の和:240

約数の個数: 80

約数和(自身を含む): 51425280

約数和(自身を除く): 30505840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 40, 58, 71, 80, 116, 127, 142, 145, 232, 254, 284, 290, 355, 464, 508, 568, 580, 635, 710, 1016, 1136, 1160, 1270, 1420, 2032, 2059, 2320, 2540, 2840, 3683, 4118, 5080, 5680, 7366, 8236, 9017, 10160, 10295, 14732, 16472, 18034, 18415, 20590, 29464, 32944, 36068, 36830, 41180, 45085, 58928, 72136, 73660, 82360, 90170, 144272, 147320, 164720, 180340, 261493, 294640, 360680, 522986, 721360, 1045972, 1307465, 2091944, 2614930, 4183888, 5229860, 10459720, 20919440]

約数ペア:

[(1, 20919440), (2, 10459720), (4, 5229860), (5, 4183888), (8, 2614930), (10, 2091944), (16, 1307465), (20, 1045972), (29, 721360), (40, 522986), (58, 360680), (71, 294640), (80, 261493), (116, 180340), (127, 164720), (142, 147320), (145, 144272), (232, 90170), (254, 82360), (284, 73660), (290, 72136), (355, 58928), (464, 45085), (508, 41180), (568, 36830), (580, 36068), (635, 32944), (710, 29464), (1016, 20590), (1136, 18415), (1160, 18034), (1270, 16472), (1420, 14732), (2032, 10295), (2059, 10160), (2320, 9017), (2540, 8236), (2840, 7366), (3683, 5680), (4118, 5080)]