19988120

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{11621}}^1$

素因数の和:11675

約数の個数: 32

約数和(自身を含む): 46023120

約数和(自身を除く): 26035000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 11621, 23242, 46484, 58105, 92968, 116210, 232420, 464840, 499703, 999406, 1998812, 2498515, 3997624, 4997030, 9994060, 19988120]

約数ペア:

[(1, 19988120), (2, 9994060), (4, 4997030), (5, 3997624), (8, 2498515), (10, 1998812), (20, 999406), (40, 499703), (43, 464840), (86, 232420), (172, 116210), (215, 92968), (344, 58105), (430, 46484), (860, 23242), (1720, 11621)]