19880720

素因数分解:

$2^4\times 5^1\times {\mathrm{248509}}^1$

素因数の和:248522

約数の個数: 20

約数和(自身を含む): 46222860

約数和(自身を除く): 26342140

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 248509, 497018, 994036, 1242545, 1988072, 2485090, 3976144, 4970180, 9940360, 19880720]

約数ペア:

[(1, 19880720), (2, 9940360), (4, 4970180), (5, 3976144), (8, 2485090), (10, 1988072), (16, 1242545), (20, 994036), (40, 497018), (80, 248509)]