20805886984 has 16 divisors (see below), whose sum is σ = 39016853100. Its totient is φ = 10401392832.

The previous prime is 20805886949. The next prime is 20805886993. The reversal of 20805886984 is 48968850802.

It can be written as a sum of positive squares in 2 ways, for example, as 20129366884 + 676520100 = 141878^2 + 26010^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135787 + ... + 245050.

Almost surely, 2^20805886984 is an apocalyptic number.

It is an amenable number.

20805886984 is a deficient number, since it is larger than the sum of its proper divisors (18210966116).

20805886984 is a wasteful number, since it uses less digits than its factorization.

20805886984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387672 (or 387668 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 58.

The spelling of 20805886984 in words is "twenty billion, eight hundred five million, eight hundred eighty-six thousand, nine hundred eighty-four".