20523057 has 4 divisors (see below), whose sum is σ = 27364080. Its totient is φ = 13682036.

The previous prime is 20523053. The next prime is 20523077. The reversal of 20523057 is 75032502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20523057 - 2² = 20523053 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20523053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3420507 + ... + 3420512.

It is an arithmetic number, because the mean of its divisors is an integer number (6841020).

Almost surely, 2^20523057 is an apocalyptic number.

It is an amenable number.

20523057 is a deficient number, since it is larger than the sum of its proper divisors (6841023).

20523057 is an equidigital number, since it uses as much as digits as its factorization.

20523057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6841022.

The product of its (nonzero) digits is 2100, while the sum is 24.

The square root of 20523057 is about 4530.2380732143. The cubic root of 20523057 is about 273.7877527633.

Adding to 20523057 its reverse (75032502), we get a palindrome (95555559).

The spelling of 20523057 in words is "twenty million, five hundred twenty-three thousand, fifty-seven".