20764895616 has 160 divisors (see below), whose sum is σ = 65431606680. Its totient is φ = 6514421760.

The previous prime is 20764895611. The next prime is 20764895623. The reversal of 20764895616 is 61659846702.

20764895616 is a `hidden beast` number, since 2 + 0 + 76 + 4 + 8 + 9 + 561 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20764895611) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 117351 + ... + 235161.

Almost surely, 2^20764895616 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 20764895616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32715803340).

20764895616 is an abundant number, since it is smaller than the sum of its proper divisors (44666711064).

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

20764895616 is a wasteful number, since it uses less digits than its factorization.

20764895616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117854 (or 117833 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 20764895616 in words is "twenty billion, seven hundred sixty-four million, eight hundred ninety-five thousand, six hundred sixteen".