20044637 has 2 divisors, whose sum is σ = 20044638. Its totient is φ = 20044636.

The previous prime is 20044627. The next prime is 20044657. The reversal of 20044637 is 73644002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13623481 + 6421156 = 3691^2 + 2534^2 .

It is a cyclic number.

It is not a de Polignac number, because 20044637 - 2¹⁶ = 19979101 is a prime.

It is equal to p_1273283 and since 20044637 and 1273283 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20044627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022318 + 10022319.

It is an arithmetic number, because the mean of its divisors is an integer number (10022319).

Almost surely, 2^20044637 is an apocalyptic number.

It is an amenable number.

20044637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20044637 is an equidigital number, since it uses as much as digits as its factorization.

20044637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20044637 is about 4477.1237418682. The cubic root of 20044637 is about 271.6435507115.

Adding to 20044637 its reverse (73644002), we get a palindrome (93688639).

The spelling of 20044637 in words is "twenty million, forty-four thousand, six hundred thirty-seven".