20535967 has 4 divisors (see below), whose sum is σ = 20747776. Its totient is φ = 20324160.

The previous prime is 20535947. The next prime is 20536013. The reversal of 20535967 is 76953502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76953502 = 2 ⋅38476751.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20535967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105759 + ... + 105952.

It is an arithmetic number, because the mean of its divisors is an integer number (5186944).

Almost surely, 2^20535967 is an apocalyptic number.

20535967 is a deficient number, since it is larger than the sum of its proper divisors (211809).

20535967 is an equidigital number, since it uses as much as digits as its factorization.

20535967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211808.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 20535967 is about 4531.6627191352. The cubic root of 20535967 is about 273.8451493296.

The spelling of 20535967 in words is "twenty million, five hundred thirty-five thousand, nine hundred sixty-seven".