20939603 has 2 divisors, whose sum is σ = 20939604. Its totient is φ = 20939602.

The previous prime is 20939593. The next prime is 20939609. The reversal of 20939603 is 30693902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20939603 - 2²² = 16745299 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20939603.

It is not a weakly prime, because it can be changed into another prime (20939609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10469801 + 10469802.

It is an arithmetic number, because the mean of its divisors is an integer number (10469802).

Almost surely, 2^20939603 is an apocalyptic number.

20939603 is a deficient number, since it is larger than the sum of its proper divisors (1).

20939603 is an equidigital number, since it uses as much as digits as its factorization.

20939603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 20939603 is about 4575.9810969889. The cubic root of 20939603 is about 275.6276704235.

The spelling of 20939603 in words is "twenty million, nine hundred thirty-nine thousand, six hundred three".