20855061 has 6 divisors (see below), whose sum is σ = 30123990. Its totient is φ = 13903368.

The previous prime is 20855059. The next prime is 20855117. The reversal of 20855061 is 16055802.

It can be written as a sum of positive squares in only one way, i.e., 18326961 + 2528100 = 4281^2 + 1590^2 .

It is not a de Polignac number, because 20855061 - 2¹ = 20855059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1158606 + ... + 1158623.

It is an arithmetic number, because the mean of its divisors is an integer number (5020665).

Almost surely, 2^20855061 is an apocalyptic number.

It is an amenable number.

20855061 is a deficient number, since it is larger than the sum of its proper divisors (9268929).

20855061 is a wasteful number, since it uses less digits than its factorization.

20855061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317235 (or 2317232 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 20855061 is about 4566.7341722504. The cubic root of 20855061 is about 275.2562284053.

The spelling of 20855061 in words is "twenty million, eight hundred fifty-five thousand, sixty-one".