20415204 has 36 divisors (see below), whose sum is σ = 51856896. Its totient is φ = 6771888.

The previous prime is 20415203. The next prime is 20415221. The reversal of 20415204 is 40251402.

It is a tau number, because it is divible by the number of its divisors (36).

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 (20415203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6757 + ... + 9299.

Almost surely, 2^20415204 is an apocalyptic number.

It is an amenable number.

20415204 is an abundant number, since it is smaller than the sum of its proper divisors (31441692).

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

20415204 is a wasteful number, since it uses less digits than its factorization.

20415204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776 (or 2771 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20415204 is about 4518.3187138581. The cubic root of 20415204 is about 273.3073060021.

Adding to 20415204 its reverse (40251402), we get a palindrome (60666606).

The spelling of 20415204 in words is "twenty million, four hundred fifteen thousand, two hundred four".