20691687524748 has 12 divisors (see below), whose sum is σ = 48280604224440. Its totient is φ = 6897229174912.

The previous prime is 20691687524719. The next prime is 20691687524791. The reversal of 20691687524748 is 84742578619602.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20691687524748² (a number of 27 digits) contains 22 as substring.

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, 862153646853 + ... + 862153646876.

It is an arithmetic number, because the mean of its divisors is an integer number (4023383685370).

Almost surely, 2^{20691687524748} is an apocalyptic number.

It is an amenable number.

20691687524748 is an abundant number, since it is smaller than the sum of its proper divisors (27588916699692).

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

20691687524748 is a wasteful number, since it uses less digits than its factorization.

20691687524748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724307293736 (or 1724307293734 counting only the distinct ones).

The product of its (nonzero) digits is 325140480, while the sum is 69.

The spelling of 20691687524748 in words is "twenty trillion, six hundred ninety-one billion, six hundred eighty-seven million, five hundred twenty-four thousand, seven hundred forty-eight".