20551004423 has 4 divisors (see below), whose sum is σ = 20586015240. Its totient is φ = 20515993608.

The previous prime is 20551004401. The next prime is 20551004497. The reversal of 20551004423 is 32440015502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20551004423 - 2⁸ = 20551004167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20551004392 and 20551004401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551004723) 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, 17504528 + ... + 17505701.

It is an arithmetic number, because the mean of its divisors is an integer number (5146503810).

Almost surely, 2^20551004423 is an apocalyptic number.

20551004423 is a deficient number, since it is larger than the sum of its proper divisors (35010817).

20551004423 is an equidigital number, since it uses as much as digits as its factorization.

20551004423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35010816.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20551004423 its reverse (32440015502), we get a palindrome (52991019925).

The spelling of 20551004423 in words is "twenty billion, five hundred fifty-one million, four thousand, four hundred twenty-three".