20737989 has 12 divisors (see below), whose sum is σ = 30108000. Its totient is φ = 13754664.

The previous prime is 20737967. The next prime is 20738021. The reversal of 20737989 is 98973702.

It is not a de Polignac number, because 20737989 - 2⁷ = 20737861 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20737939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3999 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (2509000).

Almost surely, 2^20737989 is an apocalyptic number.

It is an amenable number.

20737989 is a deficient number, since it is larger than the sum of its proper divisors (9370011).

20737989 is a wasteful number, since it uses less digits than its factorization.

20737989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11784 (or 11781 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 20737989 is about 4553.8982202065. The cubic root of 20737989 is about 274.7402020239.

The spelling of 20737989 in words is "twenty million, seven hundred thirty-seven thousand, nine hundred eighty-nine".