20448961 has 4 divisors (see below), whose sum is σ = 22021972. Its totient is φ = 18875952.

The previous prime is 20448949. The next prime is 20448991. The reversal of 20448961 is 16984402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16984402 = 2 ⋅8492201.

It can be written as a sum of positive squares in 2 ways, for example, as 12383361 + 8065600 = 3519^2 + 2840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20448961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20448941) 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, 786486 + ... + 786511.

It is an arithmetic number, because the mean of its divisors is an integer number (5505493).

Almost surely, 2^20448961 is an apocalyptic number.

It is an amenable number.

20448961 is a deficient number, since it is larger than the sum of its proper divisors (1573011).

20448961 is a wasteful number, since it uses less digits than its factorization.

20448961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573010.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20448961 is about 4522.0527418419. The cubic root of 20448961 is about 273.4578629799.

The spelling of 20448961 in words is "twenty million, four hundred forty-eight thousand, nine hundred sixty-one".