20603839 has 2 divisors, whose sum is σ = 20603840. Its totient is φ = 20603838.

The previous prime is 20603827. The next prime is 20603861. The reversal of 20603839 is 93830602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20603839 - 2⁹ = 20603327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20603839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20633839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10301919 + 10301920.

It is an arithmetic number, because the mean of its divisors is an integer number (10301920).

Almost surely, 2^20603839 is an apocalyptic number.

20603839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20603839 is an equidigital number, since it uses as much as digits as its factorization.

20603839 is an evil number, because the sum of its binary digits is even.

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

The square root of 20603839 is about 4539.1451838424. The cubic root of 20603839 is about 274.1465064438.

The spelling of 20603839 in words is "twenty million, six hundred three thousand, eight hundred thirty-nine".