20005180 has 24 divisors (see below), whose sum is σ = 45243072. Its totient is φ = 7386432.

The previous prime is 20005177. The next prime is 20005207. The reversal of 20005180 is 8150002.

It is a happy number.

20005180 is a modest number, since divided by 5180 gives 20 as remainder.

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, 38212 + ... + 38731.

It is an arithmetic number, because the mean of its divisors is an integer number (1885128).

Almost surely, 2^20005180 is an apocalyptic number.

20005180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20005180 is an abundant number, since it is smaller than the sum of its proper divisors (25237892).

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

20005180 is a wasteful number, since it uses less digits than its factorization.

20005180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76965 (or 76963 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 20005180 is about 4472.7150591112. The cubic root of 20005180 is about 271.4651941087.

Adding to 20005180 its reverse (8150002), we get a palindrome (28155182).

The spelling of 20005180 in words is "twenty million, five thousand, one hundred eighty".