20719803 has 16 divisors (see below), whose sum is σ = 31046400. Its totient is φ = 12195744.

The previous prime is 20719763. The next prime is 20719807. The reversal of 20719803 is 30891702.

It is a happy number.

It is not a de Polignac number, because 20719803 - 2⁶ = 20719739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20719807) 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 15 ways as a sum of consecutive naturals, for example, 10653 + ... + 12446.

It is an arithmetic number, because the mean of its divisors is an integer number (1940400).

Almost surely, 2^20719803 is an apocalyptic number.

20719803 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20719803 is a deficient number, since it is larger than the sum of its proper divisors (10326597).

20719803 is a wasteful number, since it uses less digits than its factorization.

20719803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23138.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 20719803 is about 4551.9010314373. The cubic root of 20719803 is about 274.6598681890.

The spelling of 20719803 in words is "twenty million, seven hundred nineteen thousand, eight hundred three".