20004180 has 48 divisors (see below), whose sum is σ = 64014720. Its totient is φ = 4572288.

The previous prime is 20004139. The next prime is 20004191. The reversal of 20004180 is 8140002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23395 + ... + 24234.

It is an arithmetic number, because the mean of its divisors is an integer number (1333640).

Almost surely, 2^20004180 is an apocalyptic number.

20004180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20004180 is an abundant number, since it is smaller than the sum of its proper divisors (44010540).

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

20004180 is a wasteful number, since it uses less digits than its factorization.

20004180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47648 (or 47646 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 20004180 is about 4472.6032687910. The cubic root of 20004180 is about 271.4606707849.

Adding to 20004180 its reverse (8140002), we get a palindrome (28144182).

The spelling of 20004180 in words is "twenty million, four thousand, one hundred eighty".