20023537 has 2 divisors, whose sum is σ = 20023538. Its totient is φ = 20023536.

The previous prime is 20023519. The next prime is 20023561. The reversal of 20023537 is 73532002.

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., 13868176 + 6155361 = 3724^2 + 2481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023537 is a prime.

It is not a weakly prime, because it can be changed into another prime (20023567) 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, 10011768 + 10011769.

It is an arithmetic number, because the mean of its divisors is an integer number (10011769).

Almost surely, 2^20023537 is an apocalyptic number.

It is an amenable number.

20023537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023537 is an equidigital number, since it uses as much as digits as its factorization.

20023537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 22.

The square root of 20023537 is about 4474.7666978291. The cubic root of 20023537 is about 271.5482019947.

Adding to 20023537 its reverse (73532002), we get a palindrome (93555539).

The spelling of 20023537 in words is "twenty million, twenty-three thousand, five hundred thirty-seven".