20691660003 has 32 divisors (see below), whose sum is σ = 33255936000. Its totient is φ = 11179122336.

The previous prime is 20691659921. The next prime is 20691660023. The reversal of 20691660003 is 30006619602.

It is a happy number.

It is not a de Polignac number, because 20691660003 - 2²⁰ = 20690611427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20691660023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149148 + ... + 252246.

It is an arithmetic number, because the mean of its divisors is an integer number (1039248000).

Almost surely, 2^20691660003 is an apocalyptic number.

20691660003 is a deficient number, since it is larger than the sum of its proper divisors (12564275997).

20691660003 is a wasteful number, since it uses less digits than its factorization.

20691660003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103631.

The product of its (nonzero) digits is 11664, while the sum is 33.

The spelling of 20691660003 in words is "twenty billion, six hundred ninety-one million, six hundred sixty thousand, three".