20394688 has 28 divisors (see below), whose sum is σ = 40680640. Its totient is φ = 10144512.

The previous prime is 20394643. The next prime is 20394691. The reversal of 20394688 is 88649302.

It is a self number, because there is not a number n which added to its sum of digits gives 20394688.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13558 + ... + 14986.

It is an arithmetic number, because the mean of its divisors is an integer number (1452880).

Almost surely, 2^20394688 is an apocalyptic number.

It is an amenable number.

20394688 is a deficient number, since it is larger than the sum of its proper divisors (20285952).

20394688 is a wasteful number, since it uses less digits than its factorization.

20394688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 20394688 is about 4516.0478296847. The cubic root of 20394688 is about 273.2157230814.

The spelling of 20394688 in words is "twenty million, three hundred ninety-four thousand, six hundred eighty-eight".