20040437 has 8 divisors (see below), whose sum is σ = 20527296. Its totient is φ = 19559232.

The previous prime is 20040409. The next prime is 20040443. The reversal of 20040437 is 73404002.

It is a happy number.

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 20040437 - 2⁶ = 20040373 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 (20040737) 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, 6248 + ... + 8894.

It is an arithmetic number, because the mean of its divisors is an integer number (2565912).

Almost surely, 2^20040437 is an apocalyptic number.

It is an amenable number.

20040437 is a deficient number, since it is larger than the sum of its proper divisors (486859).

20040437 is a wasteful number, since it uses less digits than its factorization.

20040437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 20040437 is about 4476.6546661542. The cubic root of 20040437 is about 271.6245766819.

Adding to 20040437 its reverse (73404002), we get a palindrome (93444439).

The spelling of 20040437 in words is "twenty million, forty thousand, four hundred thirty-seven".