20512955 has 4 divisors (see below), whose sum is σ = 24615552. Its totient is φ = 16410360.

The previous prime is 20512949. The next prime is 20512957. The reversal of 20512955 is 55921502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20512955 - 2⁴ = 20512939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20512957) 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 3 ways as a sum of consecutive naturals, for example, 2051291 + ... + 2051300.

It is an arithmetic number, because the mean of its divisors is an integer number (6153888).

Almost surely, 2^20512955 is an apocalyptic number.

20512955 is a deficient number, since it is larger than the sum of its proper divisors (4102597).

20512955 is an equidigital number, since it uses as much as digits as its factorization.

20512955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102596.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 20512955 is about 4529.1229835367. The cubic root of 20512955 is about 273.7428234950.

The spelling of 20512955 in words is "twenty million, five hundred twelve thousand, nine hundred fifty-five".