20767921775 has 36 divisors (see below), whose sum is σ = 26687620008. Its totient is φ = 16029478080.

The previous prime is 20767921651. The next prime is 20767921777. The reversal of 20767921775 is 57712976702.

It is not a de Polignac number, because 20767921775 - 2¹⁴ = 20767905391 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 (20767921777) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3833969 + ... + 3839381.

It is an arithmetic number, because the mean of its divisors is an integer number (741322778).

Almost surely, 2^20767921775 is an apocalyptic number.

20767921775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20767921775 is a deficient number, since it is larger than the sum of its proper divisors (5919698233).

20767921775 is an equidigital number, since it uses as much as digits as its factorization.

20767921775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5592 (or 5544 counting only the distinct ones).

The product of its (nonzero) digits is 2593080, while the sum is 53.

The spelling of 20767921775 in words is "twenty billion, seven hundred sixty-seven million, nine hundred twenty-one thousand, seven hundred seventy-five".