20449513 has 6 divisors (see below), whose sum is σ = 23788266. Its totient is φ = 17528112.

The previous prime is 20449501. The next prime is 20449523. The reversal of 20449513 is 31594402.

It can be written as a sum of positive squares in only one way, i.e., 20322064 + 127449 = 4508^2 + 357^2 .

It is not a de Polignac number, because 20449513 - 2²¹ = 18352361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20449523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 208620 + ... + 208717.

It is an arithmetic number, because the mean of its divisors is an integer number (3964711).

Almost surely, 2^20449513 is an apocalyptic number.

It is an amenable number.

20449513 is a deficient number, since it is larger than the sum of its proper divisors (3338753).

20449513 is an equidigital number, since it uses as much as digits as its factorization.

20449513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417351 (or 417344 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20449513 is about 4522.1137756585. The cubic root of 20449513 is about 273.4603235349.

The spelling of 20449513 in words is "twenty million, four hundred forty-nine thousand, five hundred thirteen".