20684472 has 16 divisors (see below), whose sum is σ = 51711240. Its totient is φ = 6894816.

The previous prime is 20684449. The next prime is 20684473. The reversal of 20684472 is 27448602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684473) 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, 430903 + ... + 430950.

Almost surely, 2^20684472 is an apocalyptic number.

It is an amenable number.

20684472 is an abundant number, since it is smaller than the sum of its proper divisors (31026768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20684472 is a wasteful number, since it uses less digits than its factorization.

20684472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861862 (or 861858 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 20684472 is about 4548.0184696195. The cubic root of 20684472 is about 274.5036645043.

The spelling of 20684472 in words is "twenty million, six hundred eighty-four thousand, four hundred seventy-two".