20785303951 has 4 divisors (see below), whose sum is σ = 21502038600. Its totient is φ = 20068569304.

The previous prime is 20785303937. The next prime is 20785303969. The reversal of 20785303951 is 15930358702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15930358702 = 2 ⋅7965179351.

It is a cyclic number.

It is not a de Polignac number, because 20785303951 - 2⁵ = 20785303919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20785303898 and 20785303907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20785304951) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 358367281 + ... + 358367338.

It is an arithmetic number, because the mean of its divisors is an integer number (5375509650).

Almost surely, 2^20785303951 is an apocalyptic number.

20785303951 is a deficient number, since it is larger than the sum of its proper divisors (716734649).

20785303951 is an equidigital number, since it uses as much as digits as its factorization.

20785303951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716734648.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 20785303951 in words is "twenty billion, seven hundred eighty-five million, three hundred three thousand, nine hundred fifty-one".