20011803 has 8 divisors (see below), whose sum is σ = 30494208. Its totient is φ = 11435304.

The previous prime is 20011799. The next prime is 20011811. The reversal of 20011803 is 30811002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20011803 - 2² = 20011799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20011603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476451 + ... + 476492.

It is an arithmetic number, because the mean of its divisors is an integer number (3811776).

Almost surely, 2^20011803 is an apocalyptic number.

20011803 is a deficient number, since it is larger than the sum of its proper divisors (10482405).

20011803 is an equidigital number, since it uses as much as digits as its factorization.

20011803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952953.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 20011803 is about 4473.4553758812. The cubic root of 20011803 is about 271.4951482774.

Adding to 20011803 its reverse (30811002), we get a palindrome (50822805).

The spelling of 20011803 in words is "twenty million, eleven thousand, eight hundred three".