20572237 has 8 divisors (see below), whose sum is σ = 23541056. Its totient is φ = 17610912.

The previous prime is 20572219. The next prime is 20572241. The reversal of 20572237 is 73227502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20572237 - 2¹⁹ = 20047949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6553 + ... + 9169.

It is an arithmetic number, because the mean of its divisors is an integer number (2942632).

Almost surely, 2^20572237 is an apocalyptic number.

It is an amenable number.

20572237 is a deficient number, since it is larger than the sum of its proper divisors (2968819).

20572237 is a wasteful number, since it uses less digits than its factorization.

20572237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3747.

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 20572237 is about 4535.6627961082. The cubic root of 20572237 is about 274.0062734991.

Adding to 20572237 its reverse (73227502), we get a palindrome (93799739).

The spelling of 20572237 in words is "twenty million, five hundred seventy-two thousand, two hundred thirty-seven".