20135537 has 2 divisors, whose sum is σ = 20135538. Its totient is φ = 20135536.

The previous prime is 20135513. The next prime is 20135539. The reversal of 20135537 is 73553102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15335056 + 4800481 = 3916^2 + 2191^2 .

It is a cyclic number.

It is not a de Polignac number, because 20135537 - 2¹⁴ = 20119153 is a prime.

Together with 20135539, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20135539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10067768 + 10067769.

It is an arithmetic number, because the mean of its divisors is an integer number (10067769).

Almost surely, 2^20135537 is an apocalyptic number.

It is an amenable number.

20135537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20135537 is an equidigital number, since it uses as much as digits as its factorization.

20135537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3150, while the sum is 26.

The square root of 20135537 is about 4487.2638656535. The cubic root of 20135537 is about 272.0535550905.

Adding to 20135537 its reverse (73553102), we get a palindrome (93688639).

The spelling of 20135537 in words is "twenty million, one hundred thirty-five thousand, five hundred thirty-seven".