20890673 has 2 divisors, whose sum is σ = 20890674. Its totient is φ = 20890672.

The previous prime is 20890669. The next prime is 20890679. The reversal of 20890673 is 37609802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20539024 + 351649 = 4532^2 + 593^2 .

It is a cyclic number.

It is not a de Polignac number, because 20890673 - 2² = 20890669 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20890679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10445336 + 10445337.

It is an arithmetic number, because the mean of its divisors is an integer number (10445337).

Almost surely, 2^20890673 is an apocalyptic number.

It is an amenable number.

20890673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20890673 is an equidigital number, since it uses as much as digits as its factorization.

20890673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20890673 is about 4570.6315756140. The cubic root of 20890673 is about 275.4128147062.

The spelling of 20890673 in words is "twenty million, eight hundred ninety thousand, six hundred seventy-three".