20943639884 has 24 divisors (see below), whose sum is σ = 38722790400. Its totient is φ = 9884054160.

The previous prime is 20943639881. The next prime is 20943639911. The reversal of 20943639884 is 48893634902.

It is a Smith number, since the sum of its digits (56) 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 (20943639881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 487844 + ... + 529035.

It is an arithmetic number, because the mean of its divisors is an integer number (1613449600).

Almost surely, 2^20943639884 is an apocalyptic number.

It is an amenable number.

20943639884 is a deficient number, since it is larger than the sum of its proper divisors (17779150516).

20943639884 is a wasteful number, since it uses less digits than its factorization.

20943639884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017173 (or 1017171 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 56.

The spelling of 20943639884 in words is "twenty billion, nine hundred forty-three million, six hundred thirty-nine thousand, eight hundred eighty-four".