20449913 has 4 divisors (see below), whose sum is σ = 22309008. Its totient is φ = 18590820.

The previous prime is 20449907. The next prime is 20449927. The reversal of 20449913 is 31994402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20449913 - 2¹⁰ = 20448889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20449913.

It is not an unprimeable number, because it can be changed into a prime (20449943) 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, 929531 + ... + 929552.

It is an arithmetic number, because the mean of its divisors is an integer number (5577252).

Almost surely, 2^20449913 is an apocalyptic number.

It is an amenable number.

20449913 is a deficient number, since it is larger than the sum of its proper divisors (1859095).

20449913 is a wasteful number, since it uses less digits than its factorization.

20449913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859094.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20449913 is about 4522.1580025470. The cubic root of 20449913 is about 273.4621065181.

The spelling of 20449913 in words is "twenty million, four hundred forty-nine thousand, nine hundred thirteen".