20686494 has 8 divisors (see below), whose sum is σ = 41373000. Its totient is φ = 6895496.

The previous prime is 20686447. The next prime is 20686513. The reversal of 20686494 is 49468602.

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

20686494 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1723869 + ... + 1723880.

It is an arithmetic number, because the mean of its divisors is an integer number (5171625).

Almost surely, 2^20686494 is an apocalyptic number.

20686494 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20686494 is a wasteful number, since it uses less digits than its factorization.

20686494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447754.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 20686494 is about 4548.2407587989. The cubic root of 20686494 is about 274.5126088680.

The spelling of 20686494 in words is "twenty million, six hundred eighty-six thousand, four hundred ninety-four".