20545818 has 16 divisors (see below), whose sum is σ = 41705760. Its totient is φ = 6746256.

The previous prime is 20545817. The next prime is 20545829. The reversal of 20545818 is 81854502.

It is not an unprimeable number, because it can be changed into a prime (20545817) 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, 25153 + ... + 25956.

It is an arithmetic number, because the mean of its divisors is an integer number (2606610).

Almost surely, 2^20545818 is an apocalyptic number.

20545818 is an abundant number, since it is smaller than the sum of its proper divisors (21159942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20545818 is a wasteful number, since it uses less digits than its factorization.

20545818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51181.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 20545818 is about 4532.7494967183. The cubic root of 20545818 is about 273.8889297098. Note that the first 3 decimals are identical.

The spelling of 20545818 in words is "twenty million, five hundred forty-five thousand, eight hundred eighteen".