20737889 has 2 divisors, whose sum is σ = 20737890. Its totient is φ = 20737888.

The previous prime is 20737883. The next prime is 20737891. The reversal of 20737889 is 98873702.

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., 20070400 + 667489 = 4480^2 + 817^2 .

It is a cyclic number.

It is not a de Polignac number, because 20737889 - 2²⁴ = 3960673 is a prime.

Together with 20737891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20737883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10368944 + 10368945.

It is an arithmetic number, because the mean of its divisors is an integer number (10368945).

Almost surely, 2^20737889 is an apocalyptic number.

It is an amenable number.

20737889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20737889 is an equidigital number, since it uses as much as digits as its factorization.

20737889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 20737889 is about 4553.8872405891. The cubic root of 20737889 is about 274.7397604178.

The spelling of 20737889 in words is "twenty million, seven hundred thirty-seven thousand, eight hundred eighty-nine".