20444729 has 2 divisors, whose sum is σ = 20444730. Its totient is φ = 20444728.

The previous prime is 20444719. The next prime is 20444731. The reversal of 20444729 is 92744402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19598329 + 846400 = 4427^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 20444729 - 2⁴ = 20444713 is a prime.

Together with 20444731, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20444695 and 20444704.

It is not a weakly prime, because it can be changed into another prime (20444719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10222364 + 10222365.

It is an arithmetic number, because the mean of its divisors is an integer number (10222365).

Almost surely, 2^20444729 is an apocalyptic number.

It is an amenable number.

20444729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20444729 is an equidigital number, since it uses as much as digits as its factorization.

20444729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20444729 is about 4521.5847885448. The cubic root of 20444729 is about 273.4389972533.

The spelling of 20444729 in words is "twenty million, four hundred forty-four thousand, seven hundred twenty-nine".