20625343521 has 4 divisors (see below), whose sum is σ = 27500458032. Its totient is φ = 13750229012.

The previous prime is 20625343513. The next prime is 20625343523. The reversal of 20625343521 is 12534352602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20625343521 - 2³ = 20625343513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20625343523) 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, 3437557251 + ... + 3437557256.

It is an arithmetic number, because the mean of its divisors is an integer number (6875114508).

Almost surely, 2^20625343521 is an apocalyptic number.

It is an amenable number.

20625343521 is a deficient number, since it is larger than the sum of its proper divisors (6875114511).

20625343521 is an equidigital number, since it uses as much as digits as its factorization.

20625343521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6875114510.

The product of its (nonzero) digits is 43200, while the sum is 33.

The spelling of 20625343521 in words is "twenty billion, six hundred twenty-five million, three hundred forty-three thousand, five hundred twenty-one".