20545255 has 4 divisors (see below), whose sum is σ = 24654312. Its totient is φ = 16436200.

The previous prime is 20545247. The next prime is 20545267. The reversal of 20545255 is 55254502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20545255 - 2³ = 20545247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054521 + ... + 2054530.

It is an arithmetic number, because the mean of its divisors is an integer number (6163578).

Almost surely, 2^20545255 is an apocalyptic number.

20545255 is a deficient number, since it is larger than the sum of its proper divisors (4109057).

20545255 is an equidigital number, since it uses as much as digits as its factorization.

20545255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109056.

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 20545255 is about 4532.6873927065. The cubic root of 20545255 is about 273.8864279699.

Adding to 20545255 its reverse (55254502), we get a palindrome (75799757).

The spelling of 20545255 in words is "twenty million, five hundred forty-five thousand, two hundred fifty-five".