20884901 has 8 divisors (see below), whose sum is σ = 21679320. Its totient is φ = 20095488.

The previous prime is 20884861. The next prime is 20884907. The reversal of 20884901 is 10948802.

It is a happy number.

It is a Cunningham number, because it is equal to 4570²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 20884900 = 1^2 + 4570^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20884901 - 2⁶ = 20884837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20884907) 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, 8705 + ... + 10841.

It is an arithmetic number, because the mean of its divisors is an integer number (2709915).

Almost surely, 2^20884901 is an apocalyptic number.

It is an amenable number.

20884901 is a deficient number, since it is larger than the sum of its proper divisors (794419).

20884901 is a wasteful number, since it uses less digits than its factorization.

20884901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20884901 is about 4570.0001094092. Note that the first 3 decimals coincide. The cubic root of 20884901 is about 275.3874472580.

The spelling of 20884901 in words is "twenty million, eight hundred eighty-four thousand, nine hundred one".