20531555453 has 8 divisors (see below), whose sum is σ = 20975452800. Its totient is φ = 20092258368.

The previous prime is 20531555449. The next prime is 20531555479. The reversal of 20531555453 is 35455513502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20531555453 - 2² = 20531555449 is a prime.

It is a super-3 number, since 3×20531555453³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531555413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1141043 + ... + 1158896.

It is an arithmetic number, because the mean of its divisors is an integer number (2621931600).

Almost surely, 2^20531555453 is an apocalyptic number.

It is an amenable number.

20531555453 is a deficient number, since it is larger than the sum of its proper divisors (443897347).

20531555453 is a wasteful number, since it uses less digits than its factorization.

20531555453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300131.

The product of its (nonzero) digits is 225000, while the sum is 38.

The spelling of 20531555453 in words is "twenty billion, five hundred thirty-one million, five hundred fifty-five thousand, four hundred fifty-three".