20740237 has 4 divisors (see below), whose sum is σ = 23703136. Its totient is φ = 17777340.

The previous prime is 20740217. The next prime is 20740241. The reversal of 20740237 is 73204702.

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 20740237 - 2¹⁵ = 20707469 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 (20740217) 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 3 ways as a sum of consecutive naturals, for example, 1481439 + ... + 1481452.

It is an arithmetic number, because the mean of its divisors is an integer number (5925784).

Almost surely, 2^20740237 is an apocalyptic number.

It is an amenable number.

20740237 is a deficient number, since it is larger than the sum of its proper divisors (2962899).

20740237 is an equidigital number, since it uses as much as digits as its factorization.

20740237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2962898.

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 20740237 is about 4554.1450350203. The cubic root of 20740237 is about 274.7501289533.

Adding to 20740237 its reverse (73204702), we get a palindrome (93944939).

The spelling of 20740237 in words is "twenty million, seven hundred forty thousand, two hundred thirty-seven".