20394864 has 60 divisors (see below), whose sum is σ = 65234416. Its totient is φ = 5826816.

The previous prime is 20394863. The next prime is 20394937. The reversal of 20394864 is 46849302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20394863) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 9109 + ... + 11124.

Almost surely, 2^20394864 is an apocalyptic number.

20394864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20394864 is an abundant number, since it is smaller than the sum of its proper divisors (44839552).

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

20394864 is a wasteful number, since it uses less digits than its factorization.

20394864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20254 (or 20245 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20394864 is about 4516.0673157073. The cubic root of 20394864 is about 273.2165090022.

It can be divided in two parts, 2039 and 4864, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 20394864 in words is "twenty million, three hundred ninety-four thousand, eight hundred sixty-four".