20734784 has 56 divisors (see below), whose sum is σ = 48572928. Its totient is φ = 8593920.

The previous prime is 20734771. The next prime is 20734793. The reversal of 20734784 is 48743702.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13142 + ... + 14634.

Almost surely, 2^20734784 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 20734784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24286464).

20734784 is an abundant number, since it is smaller than the sum of its proper divisors (27838144).

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

20734784 is a wasteful number, since it uses less digits than its factorization.

20734784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543 (or 1533 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 20734784 is about 4553.5463102949. The cubic root of 20734784 is about 274.7260478435.

The spelling of 20734784 in words is "twenty million, seven hundred thirty-four thousand, seven hundred eighty-four".