20321893 has 2 divisors, whose sum is σ = 20321894. Its totient is φ = 20321892.

The previous prime is 20321879. The next prime is 20321897. The reversal of 20321893 is 39812302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12830724 + 7491169 = 3582^2 + 2737^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321893 - 2¹³ = 20313701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160946 + 10160947.

It is an arithmetic number, because the mean of its divisors is an integer number (10160947).

Almost surely, 2^20321893 is an apocalyptic number.

It is an amenable number.

20321893 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321893 is an equidigital number, since it uses as much as digits as its factorization.

20321893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20321893 is about 4507.9810336779. The cubic root of 20321893 is about 272.8902715287.

The spelling of 20321893 in words is "twenty million, three hundred twenty-one thousand, eight hundred ninety-three".