20712557067 has 4 divisors (see below), whose sum is σ = 27616742760. Its totient is φ = 13808371376.

The previous prime is 20712557003. The next prime is 20712557069. The reversal of 20712557067 is 76075521702.

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 20712557067 - 2⁶ = 20712557003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20712557069) 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, 3452092842 + ... + 3452092847.

It is an arithmetic number, because the mean of its divisors is an integer number (6904185690).

Almost surely, 2^20712557067 is an apocalyptic number.

20712557067 is a deficient number, since it is larger than the sum of its proper divisors (6904185693).

20712557067 is an equidigital number, since it uses as much as digits as its factorization.

20712557067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6904185692.

The product of its (nonzero) digits is 205800, while the sum is 42.

The spelling of 20712557067 in words is "twenty billion, seven hundred twelve million, five hundred fifty-seven thousand, sixty-seven".