20502231 has 4 divisors (see below), whose sum is σ = 27336312. Its totient is φ = 13668152.

The previous prime is 20502203. The next prime is 20502233. The reversal of 20502231 is 13220502.

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

It is a cyclic number.

It is not a de Polignac number, because 20502231 - 2¹⁰ = 20501207 is a prime.

It is a super-2 number, since 2×20502231² = 840682951954722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20502231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502233) 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, 3417036 + ... + 3417041.

It is an arithmetic number, because the mean of its divisors is an integer number (6834078).

Almost surely, 2^20502231 is an apocalyptic number.

20502231 is a deficient number, since it is larger than the sum of its proper divisors (6834081).

20502231 is an equidigital number, since it uses as much as digits as its factorization.

20502231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6834080.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20502231 is about 4527.9389351006. The cubic root of 20502231 is about 273.6951116992.

Adding to 20502231 its reverse (13220502), we get a palindrome (33722733).

The spelling of 20502231 in words is "twenty million, five hundred two thousand, two hundred thirty-one".