20770842091 has 2 divisors, whose sum is σ = 20770842092. Its totient is φ = 20770842090.

The previous prime is 20770842067. The next prime is 20770842101. The reversal of 20770842091 is 19024807702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20770842091 - 2⁷ = 20770841963 is a prime.

It is not a weakly prime, because it can be changed into another prime (20770842791) 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 as a sum of consecutive naturals, namely, 10385421045 + 10385421046.

It is an arithmetic number, because the mean of its divisors is an integer number (10385421046).

Almost surely, 2^20770842091 is an apocalyptic number.

20770842091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20770842091 is an equidigital number, since it uses as much as digits as its factorization.

20770842091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 20770842091 in words is "twenty billion, seven hundred seventy million, eight hundred forty-two thousand, ninety-one".