20765057 has 4 divisors (see below), whose sum is σ = 20839236. Its totient is φ = 20690880.

The previous prime is 20765051. The next prime is 20765077. The reversal of 20765057 is 75056702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14409616 + 6355441 = 3796^2 + 2521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20765057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20765051) 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, 36668 + ... + 37229.

It is an arithmetic number, because the mean of its divisors is an integer number (5209809).

Almost surely, 2^20765057 is an apocalyptic number.

It is an amenable number.

20765057 is a deficient number, since it is larger than the sum of its proper divisors (74179).

20765057 is an equidigital number, since it uses as much as digits as its factorization.

20765057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74178.

The product of its (nonzero) digits is 14700, while the sum is 32.

The square root of 20765057 is about 4556.8692103241. The cubic root of 20765057 is about 274.8596837890.

The spelling of 20765057 in words is "twenty million, seven hundred sixty-five thousand, fifty-seven".