20238989 has 2 divisors, whose sum is σ = 20238990. Its totient is φ = 20238988.

The previous prime is 20238973. The next prime is 20238997. The reversal of 20238989 is 98983202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18774889 + 1464100 = 4333^2 + 1210^2 .

It is a cyclic number.

It is not a de Polignac number, because 20238989 - 2⁴ = 20238973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20238929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10119494 + 10119495.

It is an arithmetic number, because the mean of its divisors is an integer number (10119495).

Almost surely, 2^20238989 is an apocalyptic number.

It is an amenable number.

20238989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20238989 is an equidigital number, since it uses as much as digits as its factorization.

20238989 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 20238989 is about 4498.7763891974. The cubic root of 20238989 is about 272.5186767212.

The spelling of 20238989 in words is "twenty million, two hundred thirty-eight thousand, nine hundred eighty-nine".