20943166989 has 16 divisors (see below), whose sum is σ = 28304872704. Its totient is φ = 13772808000.

The previous prime is 20943166969. The next prime is 20943167033. The reversal of 20943166989 is 98966134902.

It is a happy number.

It is not a de Polignac number, because 20943166989 - 2⁸ = 20943166733 is a prime.

It is a super-2 number, since 2×20943166989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20943166919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45414 + ... + 209639.

It is an arithmetic number, because the mean of its divisors is an integer number (1769054544).

Almost surely, 2^20943166989 is an apocalyptic number.

It is an amenable number.

20943166989 is a deficient number, since it is larger than the sum of its proper divisors (7361705715).

20943166989 is a wasteful number, since it uses less digits than its factorization.

20943166989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255428.

The product of its (nonzero) digits is 5038848, while the sum is 57.

The spelling of 20943166989 in words is "twenty billion, nine hundred forty-three million, one hundred sixty-six thousand, nine hundred eighty-nine".