20456645 has 8 divisors (see below), whose sum is σ = 26779680. Its totient is φ = 14877520.

The previous prime is 20456617. The next prime is 20456651. The reversal of 20456645 is 54665402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20456645 - 2²⁰ = 19408069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185915 + ... + 186024.

It is an arithmetic number, because the mean of its divisors is an integer number (3347460).

Almost surely, 2^20456645 is an apocalyptic number.

It is an amenable number.

20456645 is a deficient number, since it is larger than the sum of its proper divisors (6323035).

20456645 is a wasteful number, since it uses less digits than its factorization.

20456645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371955.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 20456645 is about 4522.9022761939. The cubic root of 20456645 is about 273.4921106381.

The spelling of 20456645 in words is "twenty million, four hundred fifty-six thousand, six hundred forty-five".