20993083 has 2 divisors, whose sum is σ = 20993084.
Its totient is φ = 20993082.
The previous prime is 20993059. The next prime is 20993087. The reversal of 20993083 is 38039902.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 20993083 - 217 = 20862011 is a prime.
It is not a weakly prime, because it can be changed into another prime (20993087) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10496541 + 10496542.
It is an arithmetic number, because the mean of its divisors is an integer number (10496542).
Almost surely, 220993083 is an apocalyptic number.
20993083 is a deficient number, since it is larger than the sum of its proper divisors (1).
20993083 is an equidigital number, since it uses as much as digits as its factorization.
20993083 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 11664, while the sum is 34.
The square root of 20993083 is about 4581.8209262257.
The cubic root of 20993083 is about 275.8621230760.
The spelling of 20993083 in words is "twenty million, nine hundred ninety-three thousand, eighty-three".