16620417 has 32 divisors (see below), whose sum is σ = 27164160. Its totient is φ = 9959760.

The previous prime is 16620391. The next prime is 16620431. The reversal of 16620417 is 71402661.

It is not a de Polignac number, because 16620417 - 2⁶ = 16620353 is a prime.

It is a super-2 number, since 2×16620417² = 552476522507778, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (16620017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31518 + ... + 32040.

It is an arithmetic number, because the mean of its divisors is an integer number (848880).

Almost surely, 2^16620417 is an apocalyptic number.

It is an amenable number.

16620417 is a deficient number, since it is larger than the sum of its proper divisors (10543743).

16620417 is a wasteful number, since it uses less digits than its factorization.

16620417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 644 counting only the distinct ones).

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

The square root of 16620417 is about 4076.8145653193. The cubic root of 16620417 is about 255.1999815335.

The spelling of 16620417 in words is "sixteen million, six hundred twenty thousand, four hundred seventeen".