81978640

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{23831}}^1$

素因数の和:23887

約数の個数: 40

約数和(自身を含む): 195041088

約数和(自身を除く): 113062448

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 23831, 47662, 95324, 119155, 190648, 238310, 381296, 476620, 953240, 1024733, 1906480, 2049466, 4098932, 5123665, 8197864, 10247330, 16395728, 20494660, 40989320, 81978640]

約数ペア:

[(1, 81978640), (2, 40989320), (4, 20494660), (5, 16395728), (8, 10247330), (10, 8197864), (16, 5123665), (20, 4098932), (40, 2049466), (43, 1906480), (80, 1024733), (86, 953240), (172, 476620), (215, 381296), (344, 238310), (430, 190648), (688, 119155), (860, 95324), (1720, 47662), (3440, 23831)]