20855042 has 16 divisors (see below), whose sum is σ = 33764472. Its totient is φ = 9603840.

The previous prime is 20855041. The next prime is 20855057. The reversal of 20855042 is 24055802.

It can be written as a sum of positive squares in 4 ways, for example, as 17048641 + 3806401 = 4129^2 + 1951^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20858 + ... + 21834.

Almost surely, 2^20855042 is an apocalyptic number.

20855042 is a deficient number, since it is larger than the sum of its proper divisors (12909430).

20855042 is a wasteful number, since it uses less digits than its factorization.

20855042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 20855042 is about 4566.7320919888. The cubic root of 20855042 is about 275.2561448146.

The spelling of 20855042 in words is "twenty million, eight hundred fifty-five thousand, forty-two".