20005445051 has 8 divisors (see below), whose sum is σ = 20165725008. Its totient is φ = 19845280000.

The previous prime is 20005445029. The next prime is 20005445063. The reversal of 20005445051 is 15054450002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20005445051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20005445051.

It is not an unprimeable number, because it can be changed into a prime (20005445651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339671 + ... + 394191.

It is an arithmetic number, because the mean of its divisors is an integer number (2520715626).

Almost surely, 2^20005445051 is an apocalyptic number.

20005445051 is a deficient number, since it is larger than the sum of its proper divisors (160279957).

20005445051 is a wasteful number, since it uses less digits than its factorization.

20005445051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57453.

The product of its (nonzero) digits is 4000, while the sum is 26.

Adding to 20005445051 its reverse (15054450002), we get a palindrome (35059895053).

The spelling of 20005445051 in words is "twenty billion, five million, four hundred forty-five thousand, fifty-one".