20534015231 has 2 divisors, whose sum is σ = 20534015232. Its totient is φ = 20534015230.

The previous prime is 20534015209. The next prime is 20534015287. The reversal of 20534015231 is 13251043502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20534015231 - 2²⁶ = 20466906367 is a prime.

It is a super-2 number, since 2×20534015231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20534015231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20534015291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10267007615 + 10267007616.

It is an arithmetic number, because the mean of its divisors is an integer number (10267007616).

Almost surely, 2^20534015231 is an apocalyptic number.

20534015231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20534015231 is an equidigital number, since it uses as much as digits as its factorization.

20534015231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20534015231 its reverse (13251043502), we get a palindrome (33785058733).

The spelling of 20534015231 in words is "twenty billion, five hundred thirty-four million, fifteen thousand, two hundred thirty-one".