20444513 has 6 divisors (see below), whose sum is σ = 21577554. Its totient is φ = 19368144.

The previous prime is 20444509. The next prime is 20444519. The reversal of 20444513 is 31544402.

It can be written as a sum of positive squares in only one way, i.e., 19430464 + 1014049 = 4408^2 + 1007^2 .

It is not a de Polignac number, because 20444513 - 2² = 20444509 is a prime.

It is a super-2 number, since 2×20444513² = 835956223614338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20444519) 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, 27956 + ... + 28677.

It is an arithmetic number, because the mean of its divisors is an integer number (3596259).

Almost surely, 2^20444513 is an apocalyptic number.

It is an amenable number.

20444513 is a deficient number, since it is larger than the sum of its proper divisors (1133041).

20444513 is an equidigital number, since it uses as much as digits as its factorization.

20444513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56671 (or 56652 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20444513 is about 4521.5609030511. The cubic root of 20444513 is about 273.4380342825.

Adding to 20444513 its reverse (31544402), we get a palindrome (51988915).

The spelling of 20444513 in words is "twenty million, four hundred forty-four thousand, five hundred thirteen".