20551010057 has 4 divisors (see below), whose sum is σ = 20551741056. Its totient is φ = 20550279060.

The previous prime is 20551010041. The next prime is 20551010059. The reversal of 20551010057 is 75001015502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20551010057 - 2⁴ = 20551010041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20551010059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321569 + ... + 380142.

It is an arithmetic number, because the mean of its divisors is an integer number (5137935264).

Almost surely, 2^20551010057 is an apocalyptic number.

It is an amenable number.

20551010057 is a deficient number, since it is larger than the sum of its proper divisors (730999).

20551010057 is an equidigital number, since it uses as much as digits as its factorization.

20551010057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730998.

The product of its (nonzero) digits is 1750, while the sum is 26.

Adding to 20551010057 its reverse (75001015502), we get a palindrome (95552025559).

Subtracting 20551010057 from its reverse (75001015502), we obtain a palindrome (54450005445).

The spelling of 20551010057 in words is "twenty billion, five hundred fifty-one million, ten thousand, fifty-seven".