20688075723 has 24 divisors (see below), whose sum is σ = 32096709120. Its totient is φ = 11818411920.

The previous prime is 20688075713. The next prime is 20688075739. The reversal of 20688075723 is 32757088602.

It is not a de Polignac number, because 20688075723 - 2²⁵ = 20654521291 is a prime.

It is the 143834-th Hogben number.

It is not an unprimeable number, because it can be changed into a prime (20688075713) by changing a digit.

It is a nontrivial repunit in base 143833.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 558138 + ... + 594048.

It is an arithmetic number, because the mean of its divisors is an integer number (1337362880).

Almost surely, 2^20688075723 is an apocalyptic number.

20688075723 is a deficient number, since it is larger than the sum of its proper divisors (11408633397).

20688075723 is a wasteful number, since it uses less digits than its factorization.

20688075723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39847 (or 39840 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 20688075723 in words is "twenty billion, six hundred eighty-eight million, seventy-five thousand, seven hundred twenty-three".