20463664 has 40 divisors (see below), whose sum is σ = 43868720. Its totient is φ = 9186048.

The previous prime is 20463661. The next prime is 20463673. The reversal of 20463664 is 46636402.

It is not an unprimeable number, because it can be changed into a prime (20463661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6367 + ... + 9025.

It is an arithmetic number, because the mean of its divisors is an integer number (1096718).

Almost surely, 2^20463664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20463664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21934360).

20463664 is an abundant number, since it is smaller than the sum of its proper divisors (23405056).

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

20463664 is a wasteful number, since it uses less digits than its factorization.

20463664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717 (or 2711 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 20463664 is about 4523.6781494708. The cubic root of 20463664 is about 273.5233868911.

The spelling of 20463664 in words is "twenty million, four hundred sixty-three thousand, six hundred sixty-four".