20891083 has 2 divisors, whose sum is σ = 20891084. Its totient is φ = 20891082.

The previous prime is 20891081. The next prime is 20891093. The reversal of 20891083 is 38019802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20891083 - 2¹ = 20891081 is a prime.

Together with 20891081, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20891081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10445541 + 10445542.

It is an arithmetic number, because the mean of its divisors is an integer number (10445542).

Almost surely, 2^20891083 is an apocalyptic number.

20891083 is a deficient number, since it is larger than the sum of its proper divisors (1).

20891083 is an equidigital number, since it uses as much as digits as its factorization.

20891083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20891083 is about 4570.6764269635. The cubic root of 20891083 is about 275.4146164435.

The spelling of 20891083 in words is "twenty million, eight hundred ninety-one thousand, eighty-three".