20023889 has 2 divisors, whose sum is σ = 20023890. Its totient is φ = 20023888.

The previous prime is 20023859. The next prime is 20023901. The reversal of 20023889 is 98832002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 795664 = 4385^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023889 - 2¹⁶ = 19958353 is a prime.

It is a super-2 number, since 2×20023889² = 801912261368642, which contains 22 as substring.

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 (20023819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011944 + 10011945.

It is an arithmetic number, because the mean of its divisors is an integer number (10011945).

Almost surely, 2^20023889 is an apocalyptic number.

It is an amenable number.

20023889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023889 is an equidigital number, since it uses as much as digits as its factorization.

20023889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 20023889 is about 4474.8060293157. The cubic root of 20023889 is about 271.5497931955.

The spelling of 20023889 in words is "twenty million, twenty-three thousand, eight hundred eighty-nine".