20217762051 has 4 divisors (see below), whose sum is σ = 26957016072. Its totient is φ = 13478508032.

The previous prime is 20217762049. The next prime is 20217762101. The reversal of 20217762051 is 15026771202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20217762051 - 2¹ = 20217762049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20217763051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3369627006 + ... + 3369627011.

It is an arithmetic number, because the mean of its divisors is an integer number (6739254018).

Almost surely, 2^20217762051 is an apocalyptic number.

20217762051 is a deficient number, since it is larger than the sum of its proper divisors (6739254021).

20217762051 is an equidigital number, since it uses as much as digits as its factorization.

20217762051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6739254020.

The product of its (nonzero) digits is 11760, while the sum is 33.

The spelling of 20217762051 in words is "twenty billion, two hundred seventeen million, seven hundred sixty-two thousand, fifty-one".