20885495 has 16 divisors (see below), whose sum is σ = 26315712. Its totient is φ = 15882240.

The previous prime is 20885483. The next prime is 20885497. The reversal of 20885495 is 59458802.

It is not a de Polignac number, because 20885495 - 2¹⁰ = 20884471 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 (20885497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21725 + ... + 22665.

It is an arithmetic number, because the mean of its divisors is an integer number (1644732).

Almost surely, 2^20885495 is an apocalyptic number.

20885495 is a deficient number, since it is larger than the sum of its proper divisors (5430217).

20885495 is a wasteful number, since it uses less digits than its factorization.

20885495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 20885495 is about 4570.0650980046. The cubic root of 20885495 is about 275.3900580531.

The spelling of 20885495 in words is "twenty million, eight hundred eighty-five thousand, four hundred ninety-five".