20148985 has 4 divisors (see below), whose sum is σ = 24178788. Its totient is φ = 16119184.

The previous prime is 20148967. The next prime is 20149009. The reversal of 20148985 is 58984102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2483776 + 17665209 = 1576^2 + 4203^2 .

It is a cyclic number.

It is not a de Polignac number, because 20148985 - 2⁷ = 20148857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2014894 + ... + 2014903.

It is an arithmetic number, because the mean of its divisors is an integer number (6044697).

Almost surely, 2^20148985 is an apocalyptic number.

It is an amenable number.

20148985 is a deficient number, since it is larger than the sum of its proper divisors (4029803).

20148985 is an equidigital number, since it uses as much as digits as its factorization.

20148985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4029802.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 20148985 is about 4488.7620787919. The cubic root of 20148985 is about 272.1141074367.

The spelling of 20148985 in words is "twenty million, one hundred forty-eight thousand, nine hundred eighty-five".