20455678 has 4 divisors (see below), whose sum is σ = 30683520. Its totient is φ = 10227838.

The previous prime is 20455667. The next prime is 20455681. The reversal of 20455678 is 87655402.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5113918 + ... + 5113921.

It is an arithmetic number, because the mean of its divisors is an integer number (7670880).

Almost surely, 2^20455678 is an apocalyptic number.

20455678 is a deficient number, since it is larger than the sum of its proper divisors (10227842).

20455678 is a wasteful number, since it uses less digits than its factorization.

20455678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10227841.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 20455678 is about 4522.7953745444. The cubic root of 20455678 is about 273.4878011820.

The spelling of 20455678 in words is "twenty million, four hundred fifty-five thousand, six hundred seventy-eight".