20048509 has 4 divisors (see below), whose sum is σ = 21590716. Its totient is φ = 18506304.

The previous prime is 20048503. The next prime is 20048513. The reversal of 20048509 is 90584002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90584002 = 2 ⋅45292001.

It can be written as a sum of positive squares in 2 ways, for example, as 11580409 + 8468100 = 3403^2 + 2910^2 .

It is a cyclic number.

It is not a de Polignac number, because 20048509 - 2¹¹ = 20046461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20048503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771084 + ... + 771109.

It is an arithmetic number, because the mean of its divisors is an integer number (5397679).

Almost surely, 2^20048509 is an apocalyptic number.

It is an amenable number.

20048509 is a deficient number, since it is larger than the sum of its proper divisors (1542207).

20048509 is a wasteful number, since it uses less digits than its factorization.

20048509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542206.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20048509 is about 4477.5561414682. The cubic root of 20048509 is about 271.6610406118.

The spelling of 20048509 in words is "twenty million, forty-eight thousand, five hundred nine".