20604156 has 24 divisors (see below), whose sum is σ = 48171984. Its totient is φ = 6854400.

The previous prime is 20604149. The next prime is 20604173. The reversal of 20604156 is 65140602.

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, 5956 + ... + 8756.

It is an arithmetic number, because the mean of its divisors is an integer number (2007166).

Almost surely, 2^20604156 is an apocalyptic number.

It is an amenable number.

20604156 is an abundant number, since it is smaller than the sum of its proper divisors (27567828).

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

20604156 is a wasteful number, since it uses less digits than its factorization.

20604156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3421 (or 3419 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20604156 is about 4539.1801021770. The cubic root of 20604156 is about 274.1479123954.

Adding to 20604156 its reverse (65140602), we get a palindrome (85744758).

It can be divided in two parts, 2060 and 4156, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 20604156 in words is "twenty million, six hundred four thousand, one hundred fifty-six".