20688750077 has 24 divisors (see below), whose sum is σ = 22040770752. Its totient is φ = 19416024000.

The previous prime is 20688750073. The next prime is 20688750139. The reversal of 20688750077 is 77005788602.

It is not a de Polignac number, because 20688750077 - 2² = 20688750073 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20688750073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34423577 + ... + 34424177.

It is an arithmetic number, because the mean of its divisors is an integer number (918365448).

Almost surely, 2^20688750077 is an apocalyptic number.

It is an amenable number.

20688750077 is a deficient number, since it is larger than the sum of its proper divisors (1352020675).

20688750077 is a wasteful number, since it uses less digits than its factorization.

20688750077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377 (or 1358 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 50.

The spelling of 20688750077 in words is "twenty billion, six hundred eighty-eight million, seven hundred fifty thousand, seventy-seven".