28639720

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{16651}}^1$

素因数の和:16705

約数の個数: 32

約数和(自身を含む): 65941920

約数和(自身を除く): 37302200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 16651, 33302, 66604, 83255, 133208, 166510, 333020, 666040, 715993, 1431986, 2863972, 3579965, 5727944, 7159930, 14319860, 28639720]

約数ペア:

[(1, 28639720), (2, 14319860), (4, 7159930), (5, 5727944), (8, 3579965), (10, 2863972), (20, 1431986), (40, 715993), (43, 666040), (86, 333020), (172, 166510), (215, 133208), (344, 83255), (430, 66604), (860, 33302), (1720, 16651)]