20555525 has 6 divisors (see below), whose sum is σ = 25488882. Its totient is φ = 16444400.

The previous prime is 20555503. The next prime is 20555527. The reversal of 20555525 is 52555502.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 188356 + 20367169 = 434^2 + 4513^2 .

It is not a de Polignac number, because 20555525 - 2¹⁸ = 20293381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 411086 + ... + 411135.

It is an arithmetic number, because the mean of its divisors is an integer number (4248147).

Almost surely, 2^20555525 is an apocalyptic number.

20555525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20555525 is a deficient number, since it is larger than the sum of its proper divisors (4933357).

20555525 is an equidigital number, since it uses as much as digits as its factorization.

20555525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822231 (or 822226 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 29.

The square root of 20555525 is about 4533.8201331769. The cubic root of 20555525 is about 273.9320564303.

The spelling of 20555525 in words is "twenty million, five hundred fifty-five thousand, five hundred twenty-five".