20884539 has 32 divisors (see below), whose sum is σ = 31639104. Its totient is φ = 12165120.

The previous prime is 20884511. The next prime is 20884601. The reversal of 20884539 is 93548802.

It is a happy number.

It is not a de Polignac number, because 20884539 - 2¹² = 20880443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 20884497 and 20884506.

It is not an unprimeable number, because it can be changed into a prime (20884139) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58987 + ... + 59339.

It is an arithmetic number, because the mean of its divisors is an integer number (988722).

Almost surely, 2^20884539 is an apocalyptic number.

20884539 is a deficient number, since it is larger than the sum of its proper divisors (10754565).

20884539 is a wasteful number, since it uses less digits than its factorization.

20884539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 20884539 is about 4569.9605031116. The cubic root of 20884539 is about 275.3858561431.

The spelling of 20884539 in words is "twenty million, eight hundred eighty-four thousand, five hundred thirty-nine".