20471632 has 20 divisors (see below), whose sum is σ = 39970656. Its totient is φ = 10156640.

The previous prime is 20471603. The next prime is 20471639. The reversal of 20471632 is 23617402.

It is a junction number, because it is equal to n+sod(n) for n = 20471597 and 20471606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471639) 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, 2788 + ... + 6979.

Almost surely, 2^20471632 is an apocalyptic number.

It is an amenable number.

20471632 is a deficient number, since it is larger than the sum of its proper divisors (19499024).

20471632 is a wasteful number, since it uses less digits than its factorization.

20471632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9906 (or 9900 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20471632 is about 4524.5587630177. The cubic root of 20471632 is about 273.5588831661.

The spelling of 20471632 in words is "twenty million, four hundred seventy-one thousand, six hundred thirty-two".