20387566080 has 640 divisors, whose sum is σ = 85676659200. Its totient is φ = 4496228352.

The previous prime is 20387566057. The next prime is 20387566163. The reversal of 20387566080 is 8066578302.

20387566080 is a `hidden beast` number, since 2 + 0 + 3 + 8 + 7 + 566 + 0 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14030634 + ... + 14032086.

It is an arithmetic number, because the mean of its divisors is an integer number (133869780).

Almost surely, 2^20387566080 is an apocalyptic number.

20387566080 is a gapful number since it is divisible by the number (20) 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 20387566080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42838329600).

20387566080 is an abundant number, since it is smaller than the sum of its proper divisors (65289093120).

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

20387566080 is a wasteful number, since it uses less digits than its factorization.

20387566080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1499 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 20387566080 in words is "twenty billion, three hundred eighty-seven million, five hundred sixty-six thousand, eighty".