20846645 has 4 divisors (see below), whose sum is σ = 25015980. Its totient is φ = 16677312.

The previous prime is 20846627. The next prime is 20846653. The reversal of 20846645 is 54664802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10355524 + 10491121 = 3218^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 20846645 - 2²⁰ = 19798069 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2084660 + ... + 2084669.

It is an arithmetic number, because the mean of its divisors is an integer number (6253995).

Almost surely, 2^20846645 is an apocalyptic number.

It is an amenable number.

20846645 is a deficient number, since it is larger than the sum of its proper divisors (4169335).

20846645 is an equidigital number, since it uses as much as digits as its factorization.

20846645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4169334.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 20846645 is about 4565.8126330370. The cubic root of 20846645 is about 275.2191971366.

The spelling of 20846645 in words is "twenty million, eight hundred forty-six thousand, six hundred forty-five".