20685255 has 8 divisors (see below), whose sum is σ = 33096432. Its totient is φ = 11032128.

The previous prime is 20685239. The next prime is 20685307. The reversal of 20685255 is 55258602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20685255 - 2⁴ = 20685239 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689494 + ... + 689523.

It is an arithmetic number, because the mean of its divisors is an integer number (4137054).

Almost surely, 2^20685255 is an apocalyptic number.

20685255 is a deficient number, since it is larger than the sum of its proper divisors (12411177).

20685255 is a wasteful number, since it uses less digits than its factorization.

20685255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379025.

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 20685255 is about 4548.1045502495. The cubic root of 20685255 is about 274.5071281920.

The spelling of 20685255 in words is "twenty million, six hundred eighty-five thousand, two hundred fifty-five".