20664432 has 30 divisors (see below), whose sum is σ = 57832112. Its totient is φ = 6888096.

The previous prime is 20664431. The next prime is 20664433. The reversal of 20664432 is 23446602.

It is an interprime number because it is at equal distance from previous prime (20664431) and next prime (20664433).

It is a junction number, because it is equal to n+sod(n) for n = 20664396 and 20664405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71608 + ... + 71895.

Almost surely, 2^20664432 is an apocalyptic number.

It is an amenable number.

20664432 is an abundant number, since it is smaller than the sum of its proper divisors (37167680).

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

20664432 is a wasteful number, since it uses less digits than its factorization.

20664432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143517 (or 143508 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 20664432 is about 4545.8147784528. The cubic root of 20664432 is about 274.4149855676.

The spelling of 20664432 in words is "twenty million, six hundred sixty-four thousand, four hundred thirty-two".