20364784 has 60 divisors (see below), whose sum is σ = 44297512. Its totient is φ = 9060480.

The previous prime is 20364769. The next prime is 20364787. The reversal of 20364784 is 48746302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20364787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129634 + ... + 129790.

Almost surely, 2^20364784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20364784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22148756).

20364784 is an abundant number, since it is smaller than the sum of its proper divisors (23932728).

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

20364784 is a wasteful number, since it uses less digits than its factorization.

20364784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 20364784 is about 4512.7357556143. The cubic root of 20364784 is about 273.0821222882.

The spelling of 20364784 in words is "twenty million, three hundred sixty-four thousand, seven hundred eighty-four".