20531293 has 4 divisors (see below), whose sum is σ = 20541600. Its totient is φ = 20520988.

The previous prime is 20531243. The next prime is 20531297. The reversal of 20531293 is 39213502.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20531293 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 (20531297) 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, 1105 + ... + 6502.

It is an arithmetic number, because the mean of its divisors is an integer number (5135400).

Almost surely, 2^20531293 is an apocalyptic number.

It is an amenable number.

20531293 is a deficient number, since it is larger than the sum of its proper divisors (10307).

20531293 is an equidigital number, since it uses as much as digits as its factorization.

20531293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 20531293 is about 4531.1469850359. The cubic root of 20531293 is about 273.8243719727.

Adding to 20531293 its reverse (39213502), we get a palindrome (59744795).

The spelling of 20531293 in words is "twenty million, five hundred thirty-one thousand, two hundred ninety-three".