16620471 has 28 divisors (see below), whose sum is σ = 28487952. Its totient is φ = 9494496.

The previous prime is 16620463. The next prime is 16620481. The reversal of 16620471 is 17402661.

It is not a de Polignac number, because 16620471 - 2³ = 16620463 is a prime.

It is a super-3 number, since 3×16620471³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16620431) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3475 + ... + 6731.

Almost surely, 2^16620471 is an apocalyptic number.

16620471 is a deficient number, since it is larger than the sum of its proper divisors (11867481).

16620471 is an frugal number, since it uses more digits than its factorization.

16620471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282 (or 3267 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 16620471 is about 4076.8211881318. The cubic root of 16620471 is about 255.2002579162.

The spelling of 16620471 in words is "sixteen million, six hundred twenty thousand, four hundred seventy-one".