20426457 has 8 divisors (see below), whose sum is σ = 27264384. Its totient is φ = 13603088.

The previous prime is 20426447. The next prime is 20426459. The reversal of 20426457 is 75462402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20426457 - 2⁸ = 20426201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20426459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223 + ... + 6395.

It is an arithmetic number, because the mean of its divisors is an integer number (3408048).

Almost surely, 2^20426457 is an apocalyptic number.

It is an amenable number.

20426457 is a deficient number, since it is larger than the sum of its proper divisors (6837927).

20426457 is a wasteful number, since it uses less digits than its factorization.

20426457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7279.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 20426457 is about 4519.5638063866. The cubic root of 20426457 is about 273.3575130635.

Adding to 20426457 its reverse (75462402), we get a palindrome (95888859).

The spelling of 20426457 in words is "twenty million, four hundred twenty-six thousand, four hundred fifty-seven".