20298920

素因数分解:

$2^3\times 5^1\times {\mathrm{509}}^1\times {\mathrm{997}}^1$

素因数の和:1517

約数の個数: 32

約数和(自身を含む): 45808200

約数和(自身を除く): 25509280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 509, 997, 1018, 1994, 2036, 2545, 3988, 4072, 4985, 5090, 7976, 9970, 10180, 19940, 20360, 39880, 507473, 1014946, 2029892, 2537365, 4059784, 5074730, 10149460, 20298920]

約数ペア:

[(1, 20298920), (2, 10149460), (4, 5074730), (5, 4059784), (8, 2537365), (10, 2029892), (20, 1014946), (40, 507473), (509, 39880), (997, 20360), (1018, 19940), (1994, 10180), (2036, 9970), (2545, 7976), (3988, 5090), (4072, 4985)]