20850018 has 32 divisors (see below), whose sum is σ = 48948864. Its totient is φ = 5795712.

The previous prime is 20850001. The next prime is 20850019. The reversal of 20850018 is 81005802.

It is a self number, because there is not a number n which added to its sum of digits gives 20850018.

It is not an unprimeable number, because it can be changed into a prime (20850019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5155 + ... + 8262.

It is an arithmetic number, because the mean of its divisors is an integer number (1529652).

Almost surely, 2^20850018 is an apocalyptic number.

20850018 is an abundant number, since it is smaller than the sum of its proper divisors (28098846).

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

20850018 is a wasteful number, since it uses less digits than its factorization.

20850018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13466.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 20850018 is about 4566.1819937449. The cubic root of 20850018 is about 275.2340398813.

The spelling of 20850018 in words is "twenty million, eight hundred fifty thousand, eighteen".