20400662765 has 8 divisors (see below), whose sum is σ = 27978051840. Its totient is φ = 13989025872.

The previous prime is 20400662759. The next prime is 20400662803. The reversal of 20400662765 is 56726600402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20400662765 - 2⁴ = 20400662749 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 (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291438005 + ... + 291438074.

It is an arithmetic number, because the mean of its divisors is an integer number (3497256480).

Almost surely, 2^20400662765 is an apocalyptic number.

It is an amenable number.

20400662765 is a deficient number, since it is larger than the sum of its proper divisors (7577389075).

20400662765 is an equidigital number, since it uses as much as digits as its factorization.

20400662765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582876091.

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 20400662765 in words is "twenty billion, four hundred million, six hundred sixty-two thousand, seven hundred sixty-five".