16920487 has 4 divisors (see below), whose sum is σ = 16936200. Its totient is φ = 16904776.

The previous prime is 16920481. The next prime is 16920493. The reversal of 16920487 is 78402961.

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

It is an interprime number because it is at equal distance from previous prime (16920481) and next prime (16920493).

It is a cyclic number.

It is not a de Polignac number, because 16920487 - 2¹¹ = 16918439 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 (16920481) 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, 6112 + ... + 8437.

It is an arithmetic number, because the mean of its divisors is an integer number (4234050).

Almost surely, 2^16920487 is an apocalyptic number.

16920487 is a deficient number, since it is larger than the sum of its proper divisors (15713).

16920487 is a wasteful number, since it uses less digits than its factorization.

16920487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15712.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 16920487 is about 4113.4519566904. The cubic root of 16920487 is about 256.7266494618.

The spelling of 16920487 in words is "sixteen million, nine hundred twenty thousand, four hundred eighty-seven".