20023837 has 2 divisors, whose sum is σ = 20023838. Its totient is φ = 20023836.

The previous prime is 20023819. The next prime is 20023847. The reversal of 20023837 is 73832002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12809241 + 7214596 = 3579^2 + 2686^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023837 - 2²³ = 11635229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20023847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011918 + 10011919.

It is an arithmetic number, because the mean of its divisors is an integer number (10011919).

Almost surely, 2^20023837 is an apocalyptic number.

It is an amenable number.

20023837 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023837 is an equidigital number, since it uses as much as digits as its factorization.

20023837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20023837 is about 4474.8002190042. The cubic root of 20023837 is about 271.5495581330.

Adding to 20023837 its reverse (73832002), we get a palindrome (93855839).

The spelling of 20023837 in words is "twenty million, twenty-three thousand, eight hundred thirty-seven".