20009955 has 32 divisors (see below), whose sum is σ = 36864000. Its totient is φ = 9078912.

The previous prime is 20009947. The next prime is 20009981. The reversal of 20009955 is 55990002.

20009955 is nontrivially palindromic in base 13.

It is not a de Polignac number, because 20009955 - 2³ = 20009947 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 15006 + ... + 16284.

It is an arithmetic number, because the mean of its divisors is an integer number (1152000).

Almost surely, 2^20009955 is an apocalyptic number.

20009955 is a deficient number, since it is larger than the sum of its proper divisors (16854045).

20009955 is a wasteful number, since it uses less digits than its factorization.

20009955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 20009955 is about 4473.2488193705. The cubic root of 20009955 is about 271.4867909015.

Adding to 20009955 its reverse (55990002), we get a palindrome (75999957).

It can be divided in two parts, 2000995 and 5, that added together give a triangular number (2001000 = T₂₀₀₀).

The spelling of 20009955 in words is "twenty million, nine thousand, nine hundred fifty-five".