20448851 has 4 divisors (see below), whose sum is σ = 20468400. Its totient is φ = 20429304.

The previous prime is 20448829. The next prime is 20448853. The reversal of 20448851 is 15884402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20448851 - 2¹⁰ = 20447827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20448853) 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, 8111 + ... + 10328.

It is an arithmetic number, because the mean of its divisors is an integer number (5117100).

Almost surely, 2^20448851 is an apocalyptic number.

20448851 is a deficient number, since it is larger than the sum of its proper divisors (19549).

20448851 is a wasteful number, since it uses less digits than its factorization.

20448851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19548.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 20448851 is about 4522.0405792076. The cubic root of 20448851 is about 273.4573726466.

The spelling of 20448851 in words is "twenty million, four hundred forty-eight thousand, eight hundred fifty-one".