20455858 has 4 divisors (see below), whose sum is σ = 30683790. Its totient is φ = 10227928.

The previous prime is 20455847. The next prime is 20455859. The reversal of 20455858 is 85855402.

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

It can be written as a sum of positive squares in only one way, i.e., 12766329 + 7689529 = 3573^2 + 2773^2 .

It is not an unprimeable number, because it can be changed into a prime (20455859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5113963 + ... + 5113966.

Almost surely, 2^20455858 is an apocalyptic number.

20455858 is a deficient number, since it is larger than the sum of its proper divisors (10227932).

20455858 is a wasteful number, since it uses less digits than its factorization.

20455858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10227931.

The product of its (nonzero) digits is 64000, while the sum is 37.

The square root of 20455858 is about 4522.8152736985. The cubic root of 20455858 is about 273.4886033661.

The spelling of 20455858 in words is "twenty million, four hundred fifty-five thousand, eight hundred fifty-eight".