20045918 has 4 divisors (see below), whose sum is σ = 30068880. Its totient is φ = 10022958.

The previous prime is 20045887. The next prime is 20045929. The reversal of 20045918 is 81954002.

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

It is a Curzon number.

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, 5011478 + ... + 5011481.

It is an arithmetic number, because the mean of its divisors is an integer number (7517220).

Almost surely, 2^20045918 is an apocalyptic number.

20045918 is a deficient number, since it is larger than the sum of its proper divisors (10022962).

20045918 is a wasteful number, since it uses less digits than its factorization.

20045918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10022961.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20045918 is about 4477.2668001807. The cubic root of 20045918 is about 271.6493372630.

The spelling of 20045918 in words is "twenty million, forty-five thousand, nine hundred eighteen".