20219903 has 4 divisors (see below), whose sum is σ = 22058088. Its totient is φ = 18381720.

The previous prime is 20219893. The next prime is 20219911. The reversal of 20219903 is 30991202.

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 20219903 - 2⁴ = 20219887 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 (20219803) 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, 919076 + ... + 919097.

It is an arithmetic number, because the mean of its divisors is an integer number (5514522).

Almost surely, 2^20219903 is an apocalyptic number.

20219903 is a deficient number, since it is larger than the sum of its proper divisors (1838185).

20219903 is a wasteful number, since it uses less digits than its factorization.

20219903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838184.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20219903 is about 4496.6546454003. The cubic root of 20219903 is about 272.4329852321.

The spelling of 20219903 in words is "twenty million, two hundred nineteen thousand, nine hundred three".