20603389 has 2 divisors, whose sum is σ = 20603390. Its totient is φ = 20603388.

The previous prime is 20603357. The next prime is 20603417. The reversal of 20603389 is 98330602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 2199289 = 4290^2 + 1483^2 .

It is a cyclic number.

It is not a de Polignac number, because 20603389 - 2⁵ = 20603357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20603389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20603309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10301694 + 10301695.

It is an arithmetic number, because the mean of its divisors is an integer number (10301695).

Almost surely, 2^20603389 is an apocalyptic number.

It is an amenable number.

20603389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20603389 is an equidigital number, since it uses as much as digits as its factorization.

20603389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20603389 is about 4539.0956147673. The cubic root of 20603389 is about 274.1445105888.

The spelling of 20603389 in words is "twenty million, six hundred three thousand, three hundred eighty-nine".