20646417 has 16 divisors (see below), whose sum is σ = 30108672. Its totient is φ = 12480720.

The previous prime is 20646361. The next prime is 20646421. The reversal of 20646417 is 71464602.

It is not a de Polignac number, because 20646417 - 2¹¹ = 20644369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20646467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20868 + ... + 21834.

It is an arithmetic number, because the mean of its divisors is an integer number (1881792).

Almost surely, 2^20646417 is an apocalyptic number.

It is an amenable number.

20646417 is a deficient number, since it is larger than the sum of its proper divisors (9462255).

20646417 is a wasteful number, since it uses less digits than its factorization.

20646417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20646417 is about 4543.8328534399. The cubic root of 20646417 is about 274.3352185030.

The spelling of 20646417 in words is "twenty million, six hundred forty-six thousand, four hundred seventeen".