20445857 has 8 divisors (see below), whose sum is σ = 20736000. Its totient is φ = 20157984.

The previous prime is 20445851. The next prime is 20445869. The reversal of 20445857 is 75854402.

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

It is a cyclic number.

It is not a de Polignac number, because 20445857 - 2¹⁰ = 20444833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24869 + ... + 25677.

It is an arithmetic number, because the mean of its divisors is an integer number (2592000).

Almost surely, 2^20445857 is an apocalyptic number.

It is an amenable number.

20445857 is a deficient number, since it is larger than the sum of its proper divisors (290143).

20445857 is a wasteful number, since it uses less digits than its factorization.

20445857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135.

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 20445857 is about 4521.7095218512. The cubic root of 20445857 is about 273.4440259906. Note that the first 3 decimals are identical.

The spelling of 20445857 in words is "twenty million, four hundred forty-five thousand, eight hundred fifty-seven".