20205518 has 16 divisors (see below), whose sum is σ = 31872960. Its totient is φ = 9592800.

The previous prime is 20205517. The next prime is 20205529. The reversal of 20205518 is 81550202.

It is a junction number, because it is equal to n+sod(n) for n = 20205493 and 20205502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205517) 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, 683 + ... + 6393.

It is an arithmetic number, because the mean of its divisors is an integer number (1992060).

Almost surely, 2^20205518 is an apocalyptic number.

20205518 is a deficient number, since it is larger than the sum of its proper divisors (11667442).

20205518 is a wasteful number, since it uses less digits than its factorization.

20205518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5803.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20205518 is about 4495.0548383752. The cubic root of 20205518 is about 272.3683644439.

The spelling of 20205518 in words is "twenty million, two hundred five thousand, five hundred eighteen".