20023004777 has 4 divisors (see below), whose sum is σ = 20029600836. Its totient is φ = 20016408720.

The previous prime is 20023004773. The next prime is 20023004797. The reversal of 20023004777 is 77740032002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14575974361 + 5447030416 = 120731^2 + 73804^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023004777 - 2² = 20023004773 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20023004773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3293474 + ... + 3299547.

It is an arithmetic number, because the mean of its divisors is an integer number (5007400209).

Almost surely, 2^20023004777 is an apocalyptic number.

It is an amenable number.

20023004777 is a deficient number, since it is larger than the sum of its proper divisors (6596059).

20023004777 is an equidigital number, since it uses as much as digits as its factorization.

20023004777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6596058.

The product of its (nonzero) digits is 16464, while the sum is 32.

Adding to 20023004777 its reverse (77740032002), we get a palindrome (97763036779).

The spelling of 20023004777 in words is "twenty billion, twenty-three million, four thousand, seven hundred seventy-seven".