20768784384 has 64 divisors (see below), whose sum is σ = 55382842080. Its totient is φ = 6922895360.

The previous prime is 20768784371. The next prime is 20768784401. The reversal of 20768784384 is 48348786702.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7332 + ... + 203939.

Almost surely, 2^20768784384 is an apocalyptic number.

20768784384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20768784384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27691421040).

20768784384 is an abundant number, since it is smaller than the sum of its proper divisors (34614057696).

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

20768784384 is an frugal number, since it uses more digits than its factorization.

20768784384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211304 (or 211276 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 57.

The spelling of 20768784384 in words is "twenty billion, seven hundred sixty-eight million, seven hundred eighty-four thousand, three hundred eighty-four".