20993691683 has 2 divisors, whose sum is σ = 20993691684. Its totient is φ = 20993691682.

The previous prime is 20993691643. The next prime is 20993691689. The reversal of 20993691683 is 38619639902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20993691683 - 2⁸ = 20993691427 is a prime.

It is not a weakly prime, because it can be changed into another prime (20993691689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10496845841 + 10496845842.

It is an arithmetic number, because the mean of its divisors is an integer number (10496845842).

Almost surely, 2^20993691683 is an apocalyptic number.

20993691683 is a deficient number, since it is larger than the sum of its proper divisors (1).

20993691683 is an equidigital number, since it uses as much as digits as its factorization.

20993691683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 56.

The spelling of 20993691683 in words is "twenty billion, nine hundred ninety-three million, six hundred ninety-one thousand, six hundred eighty-three".