20337989 has 6 divisors (see below), whose sum is σ = 23658534. Its totient is φ = 17432520.

The previous prime is 20337979. The next prime is 20337991. The reversal of 20337989 is 98973302.

It can be written as a sum of positive squares in only one way, i.e., 19509889 + 828100 = 4417^2 + 910^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20337989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20337929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 207482 + ... + 207579.

It is an arithmetic number, because the mean of its divisors is an integer number (3943089).

Almost surely, 2^20337989 is an apocalyptic number.

It is an amenable number.

20337989 is a deficient number, since it is larger than the sum of its proper divisors (3320545).

20337989 is an equidigital number, since it uses as much as digits as its factorization.

20337989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415075 (or 415068 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 20337989 is about 4509.7659584506. The cubic root of 20337989 is about 272.9623002949.

The spelling of 20337989 in words is "twenty million, three hundred thirty-seven thousand, nine hundred eighty-nine".