20528201951 has 4 divisors (see below), whose sum is σ = 20528720112. Its totient is φ = 20527683792.

The previous prime is 20528201923. The next prime is 20528201989. The reversal of 20528201951 is 15910282502.

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-20528201951 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 (20528201651) 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, 194246 + ... + 280691.

It is an arithmetic number, because the mean of its divisors is an integer number (5132180028).

Almost surely, 2^20528201951 is an apocalyptic number.

20528201951 is a deficient number, since it is larger than the sum of its proper divisors (518161).

20528201951 is an equidigital number, since it uses as much as digits as its factorization.

20528201951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518160.

The product of its (nonzero) digits is 14400, while the sum is 35.

The spelling of 20528201951 in words is "twenty billion, five hundred twenty-eight million, two hundred one thousand, nine hundred fifty-one".