20523154331 has 4 divisors (see below), whose sum is σ = 20910383712. Its totient is φ = 20135924952.

The previous prime is 20523154321. The next prime is 20523154343. The reversal of 20523154331 is 13345132502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20523154331 is a prime.

It is a super-2 number, since 2×20523154331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20523154294 and 20523154303.

It is not an unprimeable number, because it can be changed into a prime (20523154321) 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, 193614611 + ... + 193614716.

It is an arithmetic number, because the mean of its divisors is an integer number (5227595928).

Almost surely, 2^20523154331 is an apocalyptic number.

20523154331 is a deficient number, since it is larger than the sum of its proper divisors (387229381).

20523154331 is an equidigital number, since it uses as much as digits as its factorization.

20523154331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387229380.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 20523154331 its reverse (13345132502), we get a palindrome (33868286833).

The spelling of 20523154331 in words is "twenty billion, five hundred twenty-three million, one hundred fifty-four thousand, three hundred thirty-one".