20685974 has 8 divisors (see below), whose sum is σ = 32854248. Its totient is φ = 9734560.

The previous prime is 20685971. The next prime is 20685983. The reversal of 20685974 is 47958602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20685971) 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 3 ways as a sum of consecutive naturals, for example, 304172 + ... + 304239.

It is an arithmetic number, because the mean of its divisors is an integer number (4106781).

Almost surely, 2^20685974 is an apocalyptic number.

20685974 is a deficient number, since it is larger than the sum of its proper divisors (12168274).

20685974 is a wasteful number, since it uses less digits than its factorization.

20685974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608430.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 20685974 is about 4548.1835934799. The cubic root of 20685974 is about 274.5103086917.

The spelling of 20685974 in words is "twenty million, six hundred eighty-five thousand, nine hundred seventy-four".