20646224 has 20 divisors (see below), whose sum is σ = 40681920. Its totient is φ = 10147680.

The previous prime is 20646221. The next prime is 20646233. The reversal of 20646224 is 42264602.

It is a junction number, because it is equal to n+sod(n) for n = 20646193 and 20646202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646221) 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, 9992 + ... + 11879.

It is an arithmetic number, because the mean of its divisors is an integer number (2034096).

Almost surely, 2^20646224 is an apocalyptic number.

It is an amenable number.

20646224 is a deficient number, since it is larger than the sum of its proper divisors (20035696).

20646224 is a wasteful number, since it uses less digits than its factorization.

20646224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21938 (or 21932 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 20646224 is about 4543.8116158133. The cubic root of 20646224 is about 274.3343636838.

The spelling of 20646224 in words is "twenty million, six hundred forty-six thousand, two hundred twenty-four".