20726580997 has 16 divisors (see below), whose sum is σ = 21779343360. Its totient is φ = 19698505200.

The previous prime is 20726580989. The next prime is 20726581019. The reversal of 20726580997 is 79908562702.

It is a cyclic number.

It is not a de Polignac number, because 20726580997 - 2³ = 20726580989 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 (20726580967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2048922 + ... + 2059012.

It is an arithmetic number, because the mean of its divisors is an integer number (1361208960).

Almost surely, 2^20726580997 is an apocalyptic number.

It is an amenable number.

20726580997 is a deficient number, since it is larger than the sum of its proper divisors (1052762363).

20726580997 is a wasteful number, since it uses less digits than its factorization.

20726580997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11304.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 20726580997 in words is "twenty billion, seven hundred twenty-six million, five hundred eighty thousand, nine hundred ninety-seven".