20425545 has 48 divisors (see below), whose sum is σ = 41164032. Its totient is φ = 9175680.

The previous prime is 20425523. The next prime is 20425549. The reversal of 20425545 is 54552402.

It is not a de Polignac number, because 20425545 - 2⁶ = 20425481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20425549) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18684 + ... + 19746.

It is an arithmetic number, because the mean of its divisors is an integer number (857584).

Almost surely, 2^20425545 is an apocalyptic number.

It is an amenable number.

20425545 is an abundant number, since it is smaller than the sum of its proper divisors (20738487).

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

20425545 is a wasteful number, since it uses less digits than its factorization.

20425545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 20425545 is about 4519.4629105680. The cubic root of 20425545 is about 273.3534447163.

Adding to 20425545 its reverse (54552402), we get a palindrome (74977947).

The spelling of 20425545 in words is "twenty million, four hundred twenty-five thousand, five hundred forty-five".