20605425 has 12 divisors (see below), whose sum is σ = 34067760. Its totient is φ = 10989520.

The previous prime is 20605397. The next prime is 20605463. The reversal of 20605425 is 52450602.

It is not a de Polignac number, because 20605425 - 2²³ = 12216817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20605395 and 20605404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137295 + ... + 137444.

It is an arithmetic number, because the mean of its divisors is an integer number (2838980).

Almost surely, 2^20605425 is an apocalyptic number.

20605425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20605425 is a deficient number, since it is larger than the sum of its proper divisors (13462335).

20605425 is a wasteful number, since it uses less digits than its factorization.

20605425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274752 (or 274747 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 20605425 is about 4539.3198829781. The cubic root of 20605425 is about 274.1535404923.

The spelling of 20605425 in words is "twenty million, six hundred five thousand, four hundred twenty-five".