20990337 has 8 divisors (see below), whose sum is σ = 28009920. Its totient is φ = 13982160.

The previous prime is 20990311. The next prime is 20990353. The reversal of 20990337 is 73309902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20990337 - 2⁶ = 20990273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20990298 and 20990307.

It is not an unprimeable number, because it can be changed into a prime (20992337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3412 + ... + 7322.

It is an arithmetic number, because the mean of its divisors is an integer number (3501240).

Almost surely, 2^20990337 is an apocalyptic number.

It is an amenable number.

20990337 is a deficient number, since it is larger than the sum of its proper divisors (7019583).

20990337 is a wasteful number, since it uses less digits than its factorization.

20990337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5703.

The product of its (nonzero) digits is 10206, while the sum is 33.

The square root of 20990337 is about 4581.5212539068. The cubic root of 20990337 is about 275.8500945041.

The spelling of 20990337 in words is "twenty million, nine hundred ninety thousand, three hundred thirty-seven".