20464556 has 36 divisors (see below), whose sum is σ = 41923728. Its totient is φ = 8715168.

The previous prime is 20464541. The next prime is 20464559. The reversal of 20464556 is 65546402.

It is not an unprimeable number, because it can be changed into a prime (20464559) 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 11 ways as a sum of consecutive naturals, for example, 51350 + ... + 51746.

It is an arithmetic number, because the mean of its divisors is an integer number (1164548).

Almost surely, 2^20464556 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 20464556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20961864).

20464556 is an abundant number, since it is smaller than the sum of its proper divisors (21459172).

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

20464556 is a wasteful number, since it uses less digits than its factorization.

20464556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 20464556 is about 4523.7767407333. The cubic root of 20464556 is about 273.5273610786.

The spelling of 20464556 in words is "twenty million, four hundred sixty-four thousand, five hundred fifty-six".