20813752007 has 4 divisors (see below), whose sum is σ = 20834755776. Its totient is φ = 20792748240.

The previous prime is 20813751991. The next prime is 20813752009. The reversal of 20813752007 is 70025731802.

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 20813752007 - 2⁴ = 20813751991 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 (20813752009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10500398 + ... + 10502379.

It is an arithmetic number, because the mean of its divisors is an integer number (5208688944).

Almost surely, 2^20813752007 is an apocalyptic number.

20813752007 is a deficient number, since it is larger than the sum of its proper divisors (21003769).

20813752007 is an equidigital number, since it uses as much as digits as its factorization.

20813752007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21003768.

The product of its (nonzero) digits is 23520, while the sum is 35.

The spelling of 20813752007 in words is "twenty billion, eight hundred thirteen million, seven hundred fifty-two thousand, seven".