18878120

素因数分解:

$2^3\times 5^1\times {\mathrm{683}}^1\times {\mathrm{691}}^1$

素因数の和:1385

約数の個数: 32

約数和(自身を含む): 42599520

約数和(自身を除く): 23721400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 683, 691, 1366, 1382, 2732, 2764, 3415, 3455, 5464, 5528, 6830, 6910, 13660, 13820, 27320, 27640, 471953, 943906, 1887812, 2359765, 3775624, 4719530, 9439060, 18878120]

約数ペア:

[(1, 18878120), (2, 9439060), (4, 4719530), (5, 3775624), (8, 2359765), (10, 1887812), (20, 943906), (40, 471953), (683, 27640), (691, 27320), (1366, 13820), (1382, 13660), (2732, 6910), (2764, 6830), (3415, 5528), (3455, 5464)]