19981240

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{11617}}^1$

素因数の和:11671

約数の個数: 32

約数和(自身を含む): 46007280

約数和(自身を除く): 26026040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 11617, 23234, 46468, 58085, 92936, 116170, 232340, 464680, 499531, 999062, 1998124, 2497655, 3996248, 4995310, 9990620, 19981240]

約数ペア:

[(1, 19981240), (2, 9990620), (4, 4995310), (5, 3996248), (8, 2497655), (10, 1998124), (20, 999062), (40, 499531), (43, 464680), (86, 232340), (172, 116170), (215, 92936), (344, 58085), (430, 46468), (860, 23234), (1720, 11617)]