20438994 has 16 divisors (see below), whose sum is σ = 40999968. Its totient is φ = 6792672.

The previous prime is 20438989. The next prime is 20439007. The reversal of 20438994 is 49983402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2827 + ... + 6990.

It is an arithmetic number, because the mean of its divisors is an integer number (2562498).

Almost surely, 2^20438994 is an apocalyptic number.

20438994 is an abundant number, since it is smaller than the sum of its proper divisors (20560974).

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

20438994 is a wasteful number, since it uses less digits than its factorization.

20438994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10169.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 20438994 is about 4520.9505637642. The cubic root of 20438994 is about 273.4134271858.

The spelling of 20438994 in words is "twenty million, four hundred thirty-eight thousand, nine hundred ninety-four".