20783906111 has 2 divisors, whose sum is σ = 20783906112. Its totient is φ = 20783906110.

The previous prime is 20783906057. The next prime is 20783906123. The reversal of 20783906111 is 11160938702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20783906111 - 2²² = 20779711807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20783906131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10391953055 + 10391953056.

It is an arithmetic number, because the mean of its divisors is an integer number (10391953056).

Almost surely, 2^20783906111 is an apocalyptic number.

20783906111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20783906111 is an equidigital number, since it uses as much as digits as its factorization.

20783906111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 20783906111 in words is "twenty billion, seven hundred eighty-three million, nine hundred six thousand, one hundred eleven".