20735537 has 2 divisors, whose sum is σ = 20735538. Its totient is φ = 20735536.

The previous prime is 20735521. The next prime is 20735557. The reversal of 20735537 is 73553702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12845056 + 7890481 = 3584^2 + 2809^2 .

It is a cyclic number.

It is not a de Polignac number, because 20735537 - 2⁴ = 20735521 is a prime.

It is not a weakly prime, because it can be changed into another prime (20735557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10367768 + 10367769.

It is an arithmetic number, because the mean of its divisors is an integer number (10367769).

Almost surely, 2^20735537 is an apocalyptic number.

It is an amenable number.

20735537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20735537 is an equidigital number, since it uses as much as digits as its factorization.

20735537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22050, while the sum is 32.

The square root of 20735537 is about 4553.6289923532. The cubic root of 20735537 is about 274.7293734341.

The spelling of 20735537 in words is "twenty million, seven hundred thirty-five thousand, five hundred thirty-seven".