21605720

素因数分解:

$2^3\times 5^1\times {\mathrm{421}}^1\times {\mathrm{1283}}^1$

素因数の和:1715

約数の個数: 32

約数和(自身を含む): 48766320

約数和(自身を除く): 27160600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 421, 842, 1283, 1684, 2105, 2566, 3368, 4210, 5132, 6415, 8420, 10264, 12830, 16840, 25660, 51320, 540143, 1080286, 2160572, 2700715, 4321144, 5401430, 10802860, 21605720]

約数ペア:

[(1, 21605720), (2, 10802860), (4, 5401430), (5, 4321144), (8, 2700715), (10, 2160572), (20, 1080286), (40, 540143), (421, 51320), (842, 25660), (1283, 16840), (1684, 12830), (2105, 10264), (2566, 8420), (3368, 6415), (4210, 5132)]