20425040 has 20 divisors (see below), whose sum is σ = 47488404. Its totient is φ = 8169984.

The previous prime is 20425021. The next prime is 20425049. The reversal of 20425040 is 4052402.

It can be written as a sum of positive squares in 2 ways, for example, as 14684224 + 5740816 = 3832^2 + 2396^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425049) 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, 127577 + ... + 127736.

Almost surely, 2^20425040 is an apocalyptic number.

20425040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20425040 is an abundant number, since it is smaller than the sum of its proper divisors (27063364).

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

20425040 is a wasteful number, since it uses less digits than its factorization.

20425040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255326 (or 255320 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20425040 is about 4519.4070407521. The cubic root of 20425040 is about 273.3511919061.

Adding to 20425040 its reverse (4052402), we get a palindrome (24477442).

The spelling of 20425040 in words is "twenty million, four hundred twenty-five thousand, forty".