20045537 has 2 divisors, whose sum is σ = 20045538. Its totient is φ = 20045536.

The previous prime is 20045521. The next prime is 20045549. The reversal of 20045537 is 73554002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 55696 = 4471^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 20045537 - 2⁴ = 20045521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20045507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022768 + 10022769.

It is an arithmetic number, because the mean of its divisors is an integer number (10022769).

Almost surely, 2^20045537 is an apocalyptic number.

It is an amenable number.

20045537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20045537 is an equidigital number, since it uses as much as digits as its factorization.

20045537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20045537 is about 4477.2242516988. The cubic root of 20045537 is about 271.6476162301.

Adding to 20045537 its reverse (73554002), we get a palindrome (93599539).

The spelling of 20045537 in words is "twenty million, forty-five thousand, five hundred thirty-seven".