20619903 has 4 divisors (see below), whose sum is σ = 27493208. Its totient is φ = 13746600.

The previous prime is 20619889. The next prime is 20619917. The reversal of 20619903 is 30991602.

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

It is an interprime number because it is at equal distance from previous prime (20619889) and next prime (20619917).

It is not a de Polignac number, because 20619903 - 2⁶ = 20619839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20619943) 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, 3436648 + ... + 3436653.

It is an arithmetic number, because the mean of its divisors is an integer number (6873302).

Almost surely, 2^20619903 is an apocalyptic number.

20619903 is a deficient number, since it is larger than the sum of its proper divisors (6873305).

20619903 is an equidigital number, since it uses as much as digits as its factorization.

20619903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6873304.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 20619903 is about 4540.9143352413. The cubic root of 20619903 is about 274.2177350057.

The spelling of 20619903 in words is "twenty million, six hundred nineteen thousand, nine hundred three".