20752057 has 2 divisors, whose sum is σ = 20752058. Its totient is φ = 20752056.

The previous prime is 20752033. The next prime is 20752063. The reversal of 20752057 is 75025702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18352656 + 2399401 = 4284^2 + 1549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20752057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20752657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10376028 + 10376029.

It is an arithmetic number, because the mean of its divisors is an integer number (10376029).

Almost surely, 2^20752057 is an apocalyptic number.

It is an amenable number.

20752057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20752057 is an equidigital number, since it uses as much as digits as its factorization.

20752057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4900, while the sum is 28.

The square root of 20752057 is about 4555.4425690596. The cubic root of 20752057 is about 274.8023130209.

Adding to 20752057 its reverse (75025702), we get a palindrome (95777759).

The spelling of 20752057 in words is "twenty million, seven hundred fifty-two thousand, fifty-seven".