18917720

素因数分解:

$2^3\times 5^1\times {\mathrm{313}}^1\times {\mathrm{1511}}^1$

素因数の和:1835

約数の個数: 32

約数和(自身を含む): 42729120

約数和(自身を除く): 23811400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 313, 626, 1252, 1511, 1565, 2504, 3022, 3130, 6044, 6260, 7555, 12088, 12520, 15110, 30220, 60440, 472943, 945886, 1891772, 2364715, 3783544, 4729430, 9458860, 18917720]

約数ペア:

[(1, 18917720), (2, 9458860), (4, 4729430), (5, 3783544), (8, 2364715), (10, 1891772), (20, 945886), (40, 472943), (313, 60440), (626, 30220), (1252, 15110), (1511, 12520), (1565, 12088), (2504, 7555), (3022, 6260), (3130, 6044)]