20388494 has 8 divisors (see below), whose sum is σ = 34951728. Its totient is φ = 8737920.

The previous prime is 20388481. The next prime is 20388509. The reversal of 20388494 is 49488302.

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

It is a congruent number.

It is an unprimeable number.

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, 728147 + ... + 728174.

It is an arithmetic number, because the mean of its divisors is an integer number (4368966).

Almost surely, 2^20388494 is an apocalyptic number.

20388494 is a deficient number, since it is larger than the sum of its proper divisors (14563234).

20388494 is a wasteful number, since it uses less digits than its factorization.

20388494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456330.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 20388494 is about 4515.3620009917. The cubic root of 20388494 is about 273.1880611475.

The spelling of 20388494 in words is "twenty million, three hundred eighty-eight thousand, four hundred ninety-four".