20651331907 has 8 divisors (see below), whose sum is σ = 21460579200. Its totient is φ = 19851026880.

The previous prime is 20651331871. The next prime is 20651331917. The reversal of 20651331907 is 70913315602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20651331907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20651331917) 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 7 ways as a sum of consecutive naturals, for example, 2230858 + ... + 2240095.

It is an arithmetic number, because the mean of its divisors is an integer number (2682572400).

Almost surely, 2^20651331907 is an apocalyptic number.

20651331907 is a deficient number, since it is larger than the sum of its proper divisors (809247293).

20651331907 is a wasteful number, since it uses less digits than its factorization.

20651331907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4471133.

The product of its (nonzero) digits is 34020, while the sum is 37.

The spelling of 20651331907 in words is "twenty billion, six hundred fifty-one million, three hundred thirty-one thousand, nine hundred seven".