81964040

素因数分解:

$2^3\times 5^1\times {\mathrm{181}}^1\times {\mathrm{11321}}^1$

素因数の和:11513

約数の個数: 32

約数和(自身を含む): 185454360

約数和(自身を除く): 103490320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 181, 362, 724, 905, 1448, 1810, 3620, 7240, 11321, 22642, 45284, 56605, 90568, 113210, 226420, 452840, 2049101, 4098202, 8196404, 10245505, 16392808, 20491010, 40982020, 81964040]

約数ペア:

[(1, 81964040), (2, 40982020), (4, 20491010), (5, 16392808), (8, 10245505), (10, 8196404), (20, 4098202), (40, 2049101), (181, 452840), (362, 226420), (724, 113210), (905, 90568), (1448, 56605), (1810, 45284), (3620, 22642), (7240, 11321)]