20525051111 has 4 divisors (see below), whose sum is σ = 20525403912. Its totient is φ = 20524698312.

The previous prime is 20525051101. The next prime is 20525051137. The reversal of 20525051111 is 11115052502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20525051111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525051101) 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, 66176 + ... + 213141.

It is an arithmetic number, because the mean of its divisors is an integer number (5131350978).

Almost surely, 2^20525051111 is an apocalyptic number.

20525051111 is a deficient number, since it is larger than the sum of its proper divisors (352801).

20525051111 is an equidigital number, since it uses as much as digits as its factorization.

20525051111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352800.

The product of its (nonzero) digits is 500, while the sum is 23.

The spelling of 20525051111 in words is "twenty billion, five hundred twenty-five million, fifty-one thousand, one hundred eleven".