20697372765 has 24 divisors (see below), whose sum is σ = 35957201280. Its totient is φ = 11013443424.

The previous prime is 20697372743. The next prime is 20697372821. The reversal of 20697372765 is 56727379602.

20697372765 is a `hidden beast` number, since 206 + 9 + 7 + 372 + 7 + 65 = 666.

It is not a de Polignac number, because 20697372765 - 2⁶ = 20697372701 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 504097 + ... + 543606.

It is an arithmetic number, because the mean of its divisors is an integer number (1498216720).

Almost surely, 2^20697372765 is an apocalyptic number.

It is an amenable number.

20697372765 is a deficient number, since it is larger than the sum of its proper divisors (15259828515).

20697372765 is a wasteful number, since it uses less digits than its factorization.

20697372765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048153 (or 1048150 counting only the distinct ones).

The product of its (nonzero) digits is 6667920, while the sum is 54.

The spelling of 20697372765 in words is "twenty billion, six hundred ninety-seven million, three hundred seventy-two thousand, seven hundred sixty-five".