20417425 has 24 divisors (see below), whose sum is σ = 30640896. Its totient is φ = 13175040.

The previous prime is 20417417. The next prime is 20417429. The reversal of 20417425 is 52471402.

It is not a de Polignac number, because 20417425 - 2³ = 20417417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20417425.

It is not an unprimeable number, because it can be changed into a prime (20417429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 457 + ... + 6406.

It is an arithmetic number, because the mean of its divisors is an integer number (1276704).

Almost surely, 2^20417425 is an apocalyptic number.

20417425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20417425 is a deficient number, since it is larger than the sum of its proper divisors (10223471).

20417425 is a wasteful number, since it uses less digits than its factorization.

20417425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6897 (or 6892 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 20417425 is about 4518.5644844353. The cubic root of 20417425 is about 273.3172168103.

Adding to 20417425 its reverse (52471402), we get a palindrome (72888827).

The spelling of 20417425 in words is "twenty million, four hundred seventeen thousand, four hundred twenty-five".