28720520

素因数分解:

$2^3\times 5^1\times {\mathrm{103}}^1\times {\mathrm{6971}}^1$

素因数の和:7085

約数の個数: 32

約数和(自身を含む): 65257920

約数和(自身を除く): 36537400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 103, 206, 412, 515, 824, 1030, 2060, 4120, 6971, 13942, 27884, 34855, 55768, 69710, 139420, 278840, 718013, 1436026, 2872052, 3590065, 5744104, 7180130, 14360260, 28720520]

約数ペア:

[(1, 28720520), (2, 14360260), (4, 7180130), (5, 5744104), (8, 3590065), (10, 2872052), (20, 1436026), (40, 718013), (103, 278840), (206, 139420), (412, 69710), (515, 55768), (824, 34855), (1030, 27884), (2060, 13942), (4120, 6971)]