20886640

素因数分解:

$2^4\times 5^1\times {\mathrm{131}}^1\times {\mathrm{1993}}^1$

素因数の和:2137

約数の個数: 40

約数和(自身を含む): 48956688

約数和(自身を除く): 28070048

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 131, 262, 524, 655, 1048, 1310, 1993, 2096, 2620, 3986, 5240, 7972, 9965, 10480, 15944, 19930, 31888, 39860, 79720, 159440, 261083, 522166, 1044332, 1305415, 2088664, 2610830, 4177328, 5221660, 10443320, 20886640]

約数ペア:

[(1, 20886640), (2, 10443320), (4, 5221660), (5, 4177328), (8, 2610830), (10, 2088664), (16, 1305415), (20, 1044332), (40, 522166), (80, 261083), (131, 159440), (262, 79720), (524, 39860), (655, 31888), (1048, 19930), (1310, 15944), (1993, 10480), (2096, 9965), (2620, 7972), (3986, 5240)]