20425425 has 24 divisors (see below), whose sum is σ = 34938240. Its totient is φ = 10516800.

The previous prime is 20425417. The next prime is 20425429. The reversal of 20425425 is 52452402.

It is a happy number.

It is not a de Polignac number, because 20425425 - 2³ = 20425417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20425395 and 20425404.

It is not an unprimeable number, because it can be changed into a prime (20425429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2521 + ... + 6870.

It is an arithmetic number, because the mean of its divisors is an integer number (1455760).

Almost surely, 2^20425425 is an apocalyptic number.

20425425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20425425 is a deficient number, since it is larger than the sum of its proper divisors (14512815).

20425425 is a wasteful number, since it uses less digits than its factorization.

20425425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9433 (or 9428 counting only the distinct ones).

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

The square root of 20425425 is about 4519.4496346347. The cubic root of 20425425 is about 273.3529093984.

Adding to 20425425 its reverse (52452402), we get a palindrome (72877827).

The spelling of 20425425 in words is "twenty million, four hundred twenty-five thousand, four hundred twenty-five".