80721320

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{661}}^1$

素因数の和:786

約数の個数: 64

約数和(自身を含む): 188749440

約数和(自身を除く): 108028120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 71, 86, 142, 172, 215, 284, 344, 355, 430, 568, 661, 710, 860, 1322, 1420, 1720, 2644, 2840, 3053, 3305, 5288, 6106, 6610, 12212, 13220, 15265, 24424, 26440, 28423, 30530, 46931, 56846, 61060, 93862, 113692, 122120, 142115, 187724, 227384, 234655, 284230, 375448, 469310, 568460, 938620, 1136920, 1877240, 2018033, 4036066, 8072132, 10090165, 16144264, 20180330, 40360660, 80721320]

約数ペア:

[(1, 80721320), (2, 40360660), (4, 20180330), (5, 16144264), (8, 10090165), (10, 8072132), (20, 4036066), (40, 2018033), (43, 1877240), (71, 1136920), (86, 938620), (142, 568460), (172, 469310), (215, 375448), (284, 284230), (344, 234655), (355, 227384), (430, 187724), (568, 142115), (661, 122120), (710, 113692), (860, 93862), (1322, 61060), (1420, 56846), (1720, 46931), (2644, 30530), (2840, 28423), (3053, 26440), (3305, 24424), (5288, 15265), (6106, 13220), (6610, 12212)]