20455918 has 16 divisors (see below), whose sum is σ = 35126784. Its totient is φ = 8751960.

The previous prime is 20455907. The next prime is 20455927. The reversal of 20455918 is 81955402.

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, 12783 + ... + 14293.

It is an arithmetic number, because the mean of its divisors is an integer number (2195424).

Almost surely, 2^20455918 is an apocalyptic number.

20455918 is a deficient number, since it is larger than the sum of its proper divisors (14670866).

20455918 is a wasteful number, since it uses less digits than its factorization.

20455918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 20455918 is about 4522.8219067304. The cubic root of 20455918 is about 273.4888707598.

The spelling of 20455918 in words is "twenty million, four hundred fifty-five thousand, nine hundred eighteen".