20537889 has 16 divisors (see below), whose sum is σ = 27867840. Its totient is φ = 13452480.

The previous prime is 20537861. The next prime is 20537899. The reversal of 20537889 is 98873502.

It is not a de Polignac number, because 20537889 - 2⁸ = 20537633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20537889.

It is not an unprimeable number, because it can be changed into a prime (20537899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59014 + ... + 59360.

It is an arithmetic number, because the mean of its divisors is an integer number (1741740).

Almost surely, 2^20537889 is an apocalyptic number.

It is an amenable number.

20537889 is a deficient number, since it is larger than the sum of its proper divisors (7329951).

20537889 is a wasteful number, since it uses less digits than its factorization.

20537889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 20537889 is about 4531.8747776169. The cubic root of 20537889 is about 273.8536922916.

The spelling of 20537889 in words is "twenty million, five hundred thirty-seven thousand, eight hundred eighty-nine".