20864544 has 24 divisors (see below), whose sum is σ = 54769680. Its totient is φ = 6954816.

The previous prime is 20864539. The next prime is 20864573. The reversal of 20864544 is 44546802.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108574 + ... + 108765.

It is an arithmetic number, because the mean of its divisors is an integer number (2282070).

Almost surely, 2^20864544 is an apocalyptic number.

20864544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20864544 is an abundant number, since it is smaller than the sum of its proper divisors (33905136).

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

20864544 is a wasteful number, since it uses less digits than its factorization.

20864544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217352 (or 217344 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 20864544 is about 4567.7723235731. The cubic root of 20864544 is about 275.2979426488.

The spelling of 20864544 in words is "twenty million, eight hundred sixty-four thousand, five hundred forty-four".