20785476091 has 2 divisors, whose sum is σ = 20785476092. Its totient is φ = 20785476090.

The previous prime is 20785476079. The next prime is 20785476133. The reversal of 20785476091 is 19067458702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20785476091 is a prime.

It is not a weakly prime, because it can be changed into another prime (20785476001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10392738045 + 10392738046.

It is an arithmetic number, because the mean of its divisors is an integer number (10392738046).

Almost surely, 2^20785476091 is an apocalyptic number.

20785476091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20785476091 is an equidigital number, since it uses as much as digits as its factorization.

20785476091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 20785476091 in words is "twenty billion, seven hundred eighty-five million, four hundred seventy-six thousand, ninety-one".