20731668429 has 32 divisors (see below), whose sum is σ = 28263768064. Its totient is φ = 13513832640.

The previous prime is 20731668383. The next prime is 20731668473. The reversal of 20731668429 is 92486613702.

It is not a de Polignac number, because 20731668429 - 2⁷ = 20731668301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731668479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28282947 + ... + 28283679.

It is an arithmetic number, because the mean of its divisors is an integer number (883242752).

Almost surely, 2^20731668429 is an apocalyptic number.

It is an amenable number.

20731668429 is a deficient number, since it is larger than the sum of its proper divisors (7532099635).

20731668429 is a wasteful number, since it uses less digits than its factorization.

20731668429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 20731668429 in words is "twenty billion, seven hundred thirty-one million, six hundred sixty-eight thousand, four hundred twenty-nine".