20493803 has 4 divisors (see below), whose sum is σ = 22356888. Its totient is φ = 18630720.

The previous prime is 20493791. The next prime is 20493839. The reversal of 20493803 is 30839402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20493803 is a prime.

It is a super-2 number, since 2×20493803² = 839991922805618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20493503) 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, 931526 + ... + 931547.

It is an arithmetic number, because the mean of its divisors is an integer number (5589222).

Almost surely, 2^20493803 is an apocalyptic number.

20493803 is a deficient number, since it is larger than the sum of its proper divisors (1863085).

20493803 is a wasteful number, since it uses less digits than its factorization.

20493803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863084.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20493803 is about 4527.0081731757. The cubic root of 20493803 is about 273.6576032845.

The spelling of 20493803 in words is "twenty million, four hundred ninety-three thousand, eight hundred three".