20871320

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4787}}^1$

素因数の和:4907

約数の個数: 32

約数和(自身を含む): 47401200

約数和(自身を除く): 26529880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4360, 4787, 9574, 19148, 23935, 38296, 47870, 95740, 191480, 521783, 1043566, 2087132, 2608915, 4174264, 5217830, 10435660, 20871320]

約数ペア:

[(1, 20871320), (2, 10435660), (4, 5217830), (5, 4174264), (8, 2608915), (10, 2087132), (20, 1043566), (40, 521783), (109, 191480), (218, 95740), (436, 47870), (545, 38296), (872, 23935), (1090, 19148), (2180, 9574), (4360, 4787)]