20452232551 has 4 divisors (see below), whose sum is σ = 21655305072. Its totient is φ = 19249160032.

The previous prime is 20452232539. The next prime is 20452232597. The reversal of 20452232551 is 15523225402.

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 20452232551 - 2⁹ = 20452232039 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20452232851) 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, 601536235 + ... + 601536268.

It is an arithmetic number, because the mean of its divisors is an integer number (5413826268).

Almost surely, 2^20452232551 is an apocalyptic number.

20452232551 is a deficient number, since it is larger than the sum of its proper divisors (1203072521).

20452232551 is a wasteful number, since it uses less digits than its factorization.

20452232551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203072520.

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 20452232551 its reverse (15523225402), we get a palindrome (35975457953).

The spelling of 20452232551 in words is "twenty billion, four hundred fifty-two million, two hundred thirty-two thousand, five hundred fifty-one".