20983437 has 12 divisors (see below), whose sum is σ = 30401280. Its totient is φ = 13946568.

The previous prime is 20983399. The next prime is 20983439. The reversal of 20983437 is 73438902.

It is not a de Polignac number, because 20983437 - 2¹⁰ = 20982413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20983439) 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, 237 + ... + 6482.

It is an arithmetic number, because the mean of its divisors is an integer number (2533440).

Almost surely, 2^20983437 is an apocalyptic number.

It is an amenable number.

20983437 is a deficient number, since it is larger than the sum of its proper divisors (9417843).

20983437 is a wasteful number, since it uses less digits than its factorization.

20983437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7072 (or 7069 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 20983437 is about 4580.7681670218. The cubic root of 20983437 is about 275.8198651300.

The spelling of 20983437 in words is "twenty million, nine hundred eighty-three thousand, four hundred thirty-seven".