20133237 has 4 divisors (see below), whose sum is σ = 26844320. Its totient is φ = 13422156.

The previous prime is 20133199. The next prime is 20133247. The reversal of 20133237 is 73233102.

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.

It is not a de Polignac number, because 20133237 - 2¹² = 20129141 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 (20133247) 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, 3355537 + ... + 3355542.

It is an arithmetic number, because the mean of its divisors is an integer number (6711080).

Almost surely, 2^20133237 is an apocalyptic number.

It is an amenable number.

20133237 is a deficient number, since it is larger than the sum of its proper divisors (6711083).

20133237 is an equidigital number, since it uses as much as digits as its factorization.

20133237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6711082.

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 20133237 is about 4487.0075774396. The cubic root of 20133237 is about 272.0431961746.

Adding to 20133237 its reverse (73233102), we get a palindrome (93366339).

The spelling of 20133237 in words is "twenty million, one hundred thirty-three thousand, two hundred thirty-seven".