20394816 has 56 divisors (see below), whose sum is σ = 58119264. Its totient is φ = 6274560.

The previous prime is 20394811. The next prime is 20394817. The reversal of 20394816 is 61849302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20394811) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1590 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (1037844).

Almost surely, 2^20394816 is an apocalyptic number.

20394816 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20394816 is an abundant number, since it is smaller than the sum of its proper divisors (37724448).

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

20394816 is a wasteful number, since it uses less digits than its factorization.

20394816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8199 (or 8189 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20394816 is about 4516.0620013459. The cubic root of 20394816 is about 273.2162946607.

The spelling of 20394816 in words is "twenty million, three hundred ninety-four thousand, eight hundred sixteen".