20068706595721 has 27 divisors (see below), whose sum is σ = 23749807988109. Its totient is φ = 16908634476888.

The previous prime is 20068706595719. The next prime is 20068706595731. The reversal of 20068706595721 is 12759560786002.

The square root of 20068706595721 is 4479811.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 20068706595721 - 2¹ = 20068706595719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20068706595731) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1850156520 + ... + 1850167366.

Almost surely, 2^{20068706595721} is an apocalyptic number.

20068706595721 is the 4479811-st square number.

20068706595721 is the 2239906-th centered octagonal number.

It is an amenable number.

20068706595721 is a deficient number, since it is larger than the sum of its proper divisors (3681101392388).

20068706595721 is an frugal number, since it uses more digits than its factorization.

20068706595721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21826 (or 10913 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 58.

The spelling of 20068706595721 in words is "twenty trillion, sixty-eight billion, seven hundred six million, five hundred ninety-five thousand, seven hundred twenty-one".