20425504 has 24 divisors (see below), whose sum is σ = 43869168. Its totient is φ = 9284160.

The previous prime is 20425499. The next prime is 20425507. The reversal of 20425504 is 40552402.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (20425507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28662 + ... + 29365.

It is an arithmetic number, because the mean of its divisors is an integer number (1827882).

Almost surely, 2^20425504 is an apocalyptic number.

It is an amenable number.

20425504 is an abundant number, since it is smaller than the sum of its proper divisors (23443664).

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

20425504 is a wasteful number, since it uses less digits than its factorization.

20425504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58048 (or 58040 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 20425504 is about 4519.4583746285. The cubic root of 20425504 is about 273.3532618162.

Adding to 20425504 its reverse (40552402), we get a palindrome (60977906).

It can be divided in two parts, 20 and 425504, that added together give a palindrome (425524).

The spelling of 20425504 in words is "twenty million, four hundred twenty-five thousand, five hundred four".