20916331569 has 16 divisors (see below), whose sum is σ = 35413895040. Its totient is φ = 11952189360.

The previous prime is 20916331559. The next prime is 20916331573. The reversal of 20916331569 is 96513361902.

20916331569 is a `hidden beast` number, since 2 + 0 + 9 + 1 + 633 + 1 + 5 + 6 + 9 = 666.

It is not a de Polignac number, because 20916331569 - 2⁹ = 20916331057 is a prime.

It is a super-2 number, since 2×20916331569² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20916331559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55334022 + ... + 55334399.

It is an arithmetic number, because the mean of its divisors is an integer number (2213368440).

Almost surely, 2^20916331569 is an apocalyptic number.

It is an amenable number.

20916331569 is a deficient number, since it is larger than the sum of its proper divisors (14497563471).

20916331569 is a wasteful number, since it uses less digits than its factorization.

20916331569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110668437 (or 110668431 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The spelling of 20916331569 in words is "twenty billion, nine hundred sixteen million, three hundred thirty-one thousand, five hundred sixty-nine".