20425245 has 32 divisors (see below), whose sum is σ = 34877952. Its totient is φ = 10171392.

The previous prime is 20425243. The next prime is 20425271. The reversal of 20425245 is 54252402.

It is a happy number.

It is not a de Polignac number, because 20425245 - 2¹ = 20425243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43884 + ... + 44346.

It is an arithmetic number, because the mean of its divisors is an integer number (1089936).

Almost surely, 2^20425245 is an apocalyptic number.

It is an amenable number.

20425245 is a deficient number, since it is larger than the sum of its proper divisors (14452707).

20425245 is a wasteful number, since it uses less digits than its factorization.

20425245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661.

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 20425245 is about 4519.4297206617. The cubic root of 20425245 is about 273.3521064176.

Adding to 20425245 its reverse (54252402), we get a palindrome (74677647).

The spelling of 20425245 in words is "twenty million, four hundred twenty-five thousand, two hundred forty-five".