20534425451 has 4 divisors (see below), whose sum is σ = 21196826304. Its totient is φ = 19872024600.

The previous prime is 20534425447. The next prime is 20534425453. The reversal of 20534425451 is 15452443502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15452443502 = 2 ⋅7726221751.

It is a cyclic number.

It is not a de Polignac number, because 20534425451 - 2² = 20534425447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20534425453) 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, 331200380 + ... + 331200441.

It is an arithmetic number, because the mean of its divisors is an integer number (5299206576).

Almost surely, 2^20534425451 is an apocalyptic number.

20534425451 is a deficient number, since it is larger than the sum of its proper divisors (662400853).

20534425451 is an equidigital number, since it uses as much as digits as its factorization.

20534425451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662400852.

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 20534425451 its reverse (15452443502), we get a palindrome (35986868953).

The spelling of 20534425451 in words is "twenty billion, five hundred thirty-four million, four hundred twenty-five thousand, four hundred fifty-one".