20864442 has 8 divisors (see below), whose sum is σ = 41728896. Its totient is φ = 6954812.

The previous prime is 20864429. The next prime is 20864477. The reversal of 20864442 is 24446802.

It is a sphenic number, since it is the product of 3 distinct primes.

20864442 is an admirable number.

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, 1738698 + ... + 1738709.

It is an arithmetic number, because the mean of its divisors is an integer number (5216112).

Almost surely, 2^20864442 is an apocalyptic number.

20864442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20864442 is a wasteful number, since it uses less digits than its factorization.

20864442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3477412.

The product of its (nonzero) digits is 12288, while the sum is 30.

The square root of 20864442 is about 4567.7611583795. The cubic root of 20864442 is about 275.2974940339.

The spelling of 20864442 in words is "twenty million, eight hundred sixty-four thousand, four hundred forty-two".