20045020 has 24 divisors (see below), whose sum is σ = 42223104. Its totient is φ = 7993536.

The previous prime is 20045017. The next prime is 20045063. The reversal of 20045020 is 2054002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6117 + ... + 8803.

It is an arithmetic number, because the mean of its divisors is an integer number (1759296).

Almost surely, 2^20045020 is an apocalyptic number.

20045020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20045020 is an abundant number, since it is smaller than the sum of its proper divisors (22178084).

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

20045020 is a wasteful number, since it uses less digits than its factorization.

20045020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069 (or 3067 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 20045020 is about 4477.1665146608. The cubic root of 20045020 is about 271.6452808304.

Adding to 20045020 its reverse (2054002), we get a palindrome (22099022).

The spelling of 20045020 in words is "twenty million, forty-five thousand, twenty".