16920637 has 4 divisors (see below), whose sum is σ = 17466496. Its totient is φ = 16374780.

The previous prime is 16920599. The next prime is 16920641. The reversal of 16920637 is 73602961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16920637 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 (16920647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272883 + ... + 272944.

It is an arithmetic number, because the mean of its divisors is an integer number (4366624).

Almost surely, 2^16920637 is an apocalyptic number.

It is an amenable number.

16920637 is a deficient number, since it is larger than the sum of its proper divisors (545859).

16920637 is an equidigital number, since it uses as much as digits as its factorization.

16920637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545858.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 16920637 is about 4113.4701895115. The cubic root of 16920637 is about 256.7274080862.

The spelling of 16920637 in words is "sixteen million, nine hundred twenty thousand, six hundred thirty-seven".