20887358667 has 16 divisors (see below), whose sum is σ = 33212198400. Its totient is φ = 11416692672.

The previous prime is 20887358651. The next prime is 20887358677. The reversal of 20887358667 is 76685378802.

It is not a de Polignac number, because 20887358667 - 2⁴ = 20887358651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20887358667.

It is not an unprimeable number, because it can be changed into a prime (20887358627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21622042 + ... + 21623007.

It is an arithmetic number, because the mean of its divisors is an integer number (2075762400).

Almost surely, 2^20887358667 is an apocalyptic number.

20887358667 is a deficient number, since it is larger than the sum of its proper divisors (12324839733).

20887358667 is a wasteful number, since it uses less digits than its factorization.

20887358667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43245082.

The product of its (nonzero) digits is 27095040, while the sum is 60.

The spelling of 20887358667 in words is "twenty billion, eight hundred eighty-seven million, three hundred fifty-eight thousand, six hundred sixty-seven".