20502018 has 16 divisors (see below), whose sum is σ = 45560160. Its totient is φ = 6833988.

The previous prime is 20501989. The next prime is 20502019. The reversal of 20502018 is 81020502.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20502019) 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, 189780 + ... + 189887.

It is an arithmetic number, because the mean of its divisors is an integer number (2847510).

Almost surely, 2^20502018 is an apocalyptic number.

20502018 is an abundant number, since it is smaller than the sum of its proper divisors (25058142).

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

20502018 is a wasteful number, since it uses less digits than its factorization.

20502018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379678 (or 379672 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 20502018 is about 4527.9154144043. The cubic root of 20502018 is about 273.6941638794.

The spelling of 20502018 in words is "twenty million, five hundred two thousand, eighteen".