20767394665 has 16 divisors (see below), whose sum is σ = 25217427456. Its totient is φ = 16417368000.

The previous prime is 20767394621. The next prime is 20767394699. The reversal of 20767394665 is 56649376702.

It is not a de Polignac number, because 20767394665 - 2¹⁵ = 20767361897 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72199 + ... + 216211.

It is an arithmetic number, because the mean of its divisors is an integer number (1576089216).

Almost surely, 2^20767394665 is an apocalyptic number.

It is an amenable number.

20767394665 is a deficient number, since it is larger than the sum of its proper divisors (4450032791).

20767394665 is a wasteful number, since it uses less digits than its factorization.

20767394665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144360.

The product of its (nonzero) digits is 11430720, while the sum is 55.

The spelling of 20767394665 in words is "twenty billion, seven hundred sixty-seven million, three hundred ninety-four thousand, six hundred sixty-five".