20356425 has 18 divisors (see below), whose sum is σ = 36461022. Its totient is φ = 10856640.

The previous prime is 20356421. The next prime is 20356433. The reversal of 20356425 is 52465302.

It can be written as a sum of positive squares in 3 ways, for example, as 3316041 + 17040384 = 1821^2 + 4128^2 .

It is not a de Polignac number, because 20356425 - 2² = 20356421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20356421) 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 17 ways as a sum of consecutive naturals, for example, 45012 + ... + 45461.

Almost surely, 2^20356425 is an apocalyptic number.

20356425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20356425 is a deficient number, since it is larger than the sum of its proper divisors (16104597).

20356425 is a wasteful number, since it uses less digits than its factorization.

20356425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90489 (or 90481 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20356425 is about 4511.8095039574. The cubic root of 20356425 is about 273.0447537627.

The spelling of 20356425 in words is "twenty million, three hundred fifty-six thousand, four hundred twenty-five".