20955903 has 4 divisors (see below), whose sum is σ = 27941208. Its totient is φ = 13970600.

The previous prime is 20955899. The next prime is 20955911. The reversal of 20955903 is 30955902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20955903 - 2² = 20955899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20955953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3492648 + ... + 3492653.

It is an arithmetic number, because the mean of its divisors is an integer number (6985302).

Almost surely, 2^20955903 is an apocalyptic number.

20955903 is a deficient number, since it is larger than the sum of its proper divisors (6985305).

20955903 is an equidigital number, since it uses as much as digits as its factorization.

20955903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6985304.

The product of its (nonzero) digits is 12150, while the sum is 33.

The square root of 20955903 is about 4577.7617893464. The cubic root of 20955903 is about 275.6991707567.

Subtracting 20955903 from its reverse (30955902), we obtain a palindrome (9999999).

The spelling of 20955903 in words is "twenty million, nine hundred fifty-five thousand, nine hundred three".