20884421 has 8 divisors (see below), whose sum is σ = 21612288. Its totient is φ = 20160000.

The previous prime is 20884399. The next prime is 20884427. The reversal of 20884421 is 12448802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20884421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20884427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19346 + ... + 20396.

It is an arithmetic number, because the mean of its divisors is an integer number (2701536).

Almost surely, 2^20884421 is an apocalyptic number.

It is an amenable number.

20884421 is a deficient number, since it is larger than the sum of its proper divisors (727867).

20884421 is a wasteful number, since it uses less digits than its factorization.

20884421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723.

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 20884421 is about 4569.9475926973. The cubic root of 20884421 is about 275.3853374884.

The spelling of 20884421 in words is "twenty million, eight hundred eighty-four thousand, four hundred twenty-one".