20544389 has 2 divisors, whose sum is σ = 20544390. Its totient is φ = 20544388.

The previous prime is 20544343. The next prime is 20544397. The reversal of 20544389 is 98344502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12888100 + 7656289 = 3590^2 + 2767^2 .

It is a cyclic number.

It is not a de Polignac number, because 20544389 - 2¹² = 20540293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20544319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272194 + 10272195.

It is an arithmetic number, because the mean of its divisors is an integer number (10272195).

Almost surely, 2^20544389 is an apocalyptic number.

It is an amenable number.

20544389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20544389 is an equidigital number, since it uses as much as digits as its factorization.

20544389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20544389 is about 4532.5918633824. The cubic root of 20544389 is about 273.8825797338.

The spelling of 20544389 in words is "twenty million, five hundred forty-four thousand, three hundred eighty-nine".