20023437 has 8 divisors (see below), whose sum is σ = 30511936. Its totient is φ = 11441952.

The previous prime is 20023429. The next prime is 20023441. The reversal of 20023437 is 73432002.

It is a happy number.

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

It is not a de Polignac number, because 20023437 - 2³ = 20023429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 953497 = 20023437 / (2 + 0 + 0 + 2 + 3 + 4 + 3 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023417) 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, 476728 + ... + 476769.

It is an arithmetic number, because the mean of its divisors is an integer number (3813992).

Almost surely, 2^20023437 is an apocalyptic number.

It is an amenable number.

20023437 is a deficient number, since it is larger than the sum of its proper divisors (10488499).

20023437 is an equidigital number, since it uses as much as digits as its factorization.

20023437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953507.

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 20023437 is about 4474.7555240482. The cubic root of 20023437 is about 271.5477499456.

Adding to 20023437 its reverse (73432002), we get a palindrome (93455439).

The spelling of 20023437 in words is "twenty million, twenty-three thousand, four hundred thirty-seven".