16920871 has 4 divisors (see below), whose sum is σ = 18459144. Its totient is φ = 15382600.

The previous prime is 16920859. The next prime is 16920901. The reversal of 16920871 is 17802961.

It is a happy number.

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-16920871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16920821) 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, 769120 + ... + 769141.

It is an arithmetic number, because the mean of its divisors is an integer number (4614786).

Almost surely, 2^16920871 is an apocalyptic number.

16920871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16920871 is a deficient number, since it is larger than the sum of its proper divisors (1538273).

16920871 is a wasteful number, since it uses less digits than its factorization.

16920871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538272.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 16920871 is about 4113.4986325511. The cubic root of 16920871 is about 256.7285915313.

The spelling of 16920871 in words is "sixteen million, nine hundred twenty thousand, eight hundred seventy-one".