20903899 has 2 divisors, whose sum is σ = 20903900. Its totient is φ = 20903898.

The previous prime is 20903893. The next prime is 20903903. The reversal of 20903899 is 99830902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20903899 - 2¹⁵ = 20871131 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20903893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10451949 + 10451950.

It is an arithmetic number, because the mean of its divisors is an integer number (10451950).

Almost surely, 2^20903899 is an apocalyptic number.

20903899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20903899 is an equidigital number, since it uses as much as digits as its factorization.

20903899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 20903899 is about 4572.0781926822. The cubic root of 20903899 is about 275.4709242341.

The spelling of 20903899 in words is "twenty million, nine hundred three thousand, eight hundred ninety-nine".