20685293 has 8 divisors (see below), whose sum is σ = 20956320. Its totient is φ = 20416240.

The previous prime is 20685239. The next prime is 20685307. The reversal of 20685293 is 39258602.

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

It is a cyclic number.

It is not a de Polignac number, because 20685293 - 2¹⁶ = 20619757 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 (20682293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34946 + ... + 35532.

It is an arithmetic number, because the mean of its divisors is an integer number (2619540).

Almost surely, 2^20685293 is an apocalyptic number.

It is an amenable number.

20685293 is a deficient number, since it is larger than the sum of its proper divisors (271027).

20685293 is a wasteful number, since it uses less digits than its factorization.

20685293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 20685293 is about 4548.1087278120. The cubic root of 20685293 is about 274.5072962871.

The spelling of 20685293 in words is "twenty million, six hundred eighty-five thousand, two hundred ninety-three".