20530431055 has 32 divisors (see below), whose sum is σ = 27413964864. Its totient is φ = 14690543616.

The previous prime is 20530431049. The next prime is 20530431059. The reversal of 20530431055 is 55013403502.

It is a cyclic number.

It is not a de Polignac number, because 20530431055 - 2⁷ = 20530430927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20530431059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59329 + ... + 211141.

It is an arithmetic number, because the mean of its divisors is an integer number (856686402).

Almost surely, 2^20530431055 is an apocalyptic number.

20530431055 is a deficient number, since it is larger than the sum of its proper divisors (6883533809).

20530431055 is a wasteful number, since it uses less digits than its factorization.

20530431055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151915.

The product of its (nonzero) digits is 9000, while the sum is 28.

Adding to 20530431055 its reverse (55013403502), we get a palindrome (75543834557).

The spelling of 20530431055 in words is "twenty billion, five hundred thirty million, four hundred thirty-one thousand, fifty-five".