20494427 has 2 divisors, whose sum is σ = 20494428. Its totient is φ = 20494426.

The previous prime is 20494423. The next prime is 20494433. The reversal of 20494427 is 72449402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20494427 - 2² = 20494423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20494393 and 20494402.

It is not a weakly prime, because it can be changed into another prime (20494423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10247213 + 10247214.

It is an arithmetic number, because the mean of its divisors is an integer number (10247214).

Almost surely, 2^20494427 is an apocalyptic number.

20494427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20494427 is an equidigital number, since it uses as much as digits as its factorization.

20494427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20494427 is about 4527.0770923411. The cubic root of 20494427 is about 273.6603807194.

The spelling of 20494427 in words is "twenty million, four hundred ninety-four thousand, four hundred twenty-seven".