20494686 has 8 divisors (see below), whose sum is σ = 40989384. Its totient is φ = 6831560.

The previous prime is 20494667. The next prime is 20494699. The reversal of 20494686 is 68649402.

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

20494686 is an admirable number.

It is a super-3 number, since 3×20494686³ (a number of 23 digits) contains 333 as substring.

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, 1707885 + ... + 1707896.

It is an arithmetic number, because the mean of its divisors is an integer number (5123673).

Almost surely, 2^20494686 is an apocalyptic number.

20494686 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.

20494686 is a wasteful number, since it uses less digits than its factorization.

20494686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415786.

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

The square root of 20494686 is about 4527.1056979046. The cubic root of 20494686 is about 273.6615335163.

The spelling of 20494686 in words is "twenty million, four hundred ninety-four thousand, six hundred eighty-six".