16620071 has 4 divisors (see below), whose sum is σ = 17898552. Its totient is φ = 15341592.

The previous prime is 16620049. The next prime is 16620119. The reversal of 16620071 is 17002661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16620071 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 (16620001) 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, 639221 + ... + 639246.

It is an arithmetic number, because the mean of its divisors is an integer number (4474638).

Almost surely, 2^16620071 is an apocalyptic number.

16620071 is a deficient number, since it is larger than the sum of its proper divisors (1278481).

16620071 is a wasteful number, since it uses less digits than its factorization.

16620071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278480.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 16620071 is about 4076.7721300068. The cubic root of 16620071 is about 255.1982106232.

The spelling of 16620071 in words is "sixteen million, six hundred twenty thousand, seventy-one".