20329889 has 2 divisors, whose sum is σ = 20329890. Its totient is φ = 20329888.

The previous prime is 20329879. The next prime is 20329901. The reversal of 20329889 is 98892302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12673600 + 7656289 = 3560^2 + 2767^2 .

It is a cyclic number.

It is not a de Polignac number, because 20329889 - 2¹² = 20325793 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20329879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10164944 + 10164945.

It is an arithmetic number, because the mean of its divisors is an integer number (10164945).

Almost surely, 2^20329889 is an apocalyptic number.

It is an amenable number.

20329889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20329889 is an equidigital number, since it uses as much as digits as its factorization.

20329889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 20329889 is about 4508.8678179783. The cubic root of 20329889 is about 272.9260579666.

The spelling of 20329889 in words is "twenty million, three hundred twenty-nine thousand, eight hundred eighty-nine".