20340437 has 8 divisors (see below), whose sum is σ = 22054200. Its totient is φ = 18648000.

The previous prime is 20340413. The next prime is 20340443. The reversal of 20340437 is 73404302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 323761 + 20016676 = 569^2 + 4474^2 .

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 20340437 - 2⁶ = 20340373 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 (20340407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3314 + ... + 7187.

It is an arithmetic number, because the mean of its divisors is an integer number (2756775).

Almost surely, 2^20340437 is an apocalyptic number.

It is an amenable number.

20340437 is a deficient number, since it is larger than the sum of its proper divisors (1713763).

20340437 is a wasteful number, since it uses less digits than its factorization.

20340437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10663.

The product of its (nonzero) digits is 2016, while the sum is 23.

The square root of 20340437 is about 4510.0373612643. The cubic root of 20340437 is about 272.9732516383.

Adding to 20340437 its reverse (73404302), we get a palindrome (93744739).

The spelling of 20340437 in words is "twenty million, three hundred forty thousand, four hundred thirty-seven".