20691048512 has 28 divisors (see below), whose sum is σ = 41422166076. Its totient is φ = 10253967360.

The previous prime is 20691048481. The next prime is 20691048541. The reversal of 20691048512 is 21584019602.

It can be written as a sum of positive squares in 2 ways, for example, as 3125257216 + 17565791296 = 55904^2 + 132536^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1423289 + ... + 1437752.

Almost surely, 2^20691048512 is an apocalyptic number.

It is an amenable number.

20691048512 is an abundant number, since it is smaller than the sum of its proper divisors (20731117564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20691048512 is a wasteful number, since it uses less digits than its factorization.

20691048512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861166 (or 2861156 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 20691048512 in words is "twenty billion, six hundred ninety-one million, forty-eight thousand, five hundred twelve".