20257111065 has 32 divisors (see below), whose sum is σ = 32915414016. Its totient is φ = 10637023680.

The previous prime is 20257111051. The next prime is 20257111067. The reversal of 20257111065 is 56011175202.

It is not a de Polignac number, because 20257111065 - 2⁹ = 20257110553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20257111067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222900 + ... + 300330.

It is an arithmetic number, because the mean of its divisors is an integer number (1028606688).

Almost surely, 2^20257111065 is an apocalyptic number.

It is an amenable number.

20257111065 is a deficient number, since it is larger than the sum of its proper divisors (12658302951).

20257111065 is a wasteful number, since it uses less digits than its factorization.

20257111065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77709.

The product of its (nonzero) digits is 4200, while the sum is 30.

Adding to 20257111065 its reverse (56011175202), we get a palindrome (76268286267).

The spelling of 20257111065 in words is "twenty billion, two hundred fifty-seven million, one hundred eleven thousand, sixty-five".