20525143451 has 4 divisors (see below), whose sum is σ = 20530578600. Its totient is φ = 20519708304.

The previous prime is 20525143439. The next prime is 20525143519. The reversal of 20525143451 is 15434152502.

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 20525143451 - 2²⁶ = 20458034587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20525143651) 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, 2711906 + ... + 2719463.

It is an arithmetic number, because the mean of its divisors is an integer number (5132644650).

Almost surely, 2^20525143451 is an apocalyptic number.

20525143451 is a deficient number, since it is larger than the sum of its proper divisors (5435149).

20525143451 is an equidigital number, since it uses as much as digits as its factorization.

20525143451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5435148.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 20525143451 its reverse (15434152502), we get a palindrome (35959295953).

The spelling of 20525143451 in words is "twenty billion, five hundred twenty-five million, one hundred forty-three thousand, four hundred fifty-one".