20927691697831 has 8 divisors (see below), whose sum is σ = 20936719126400. Its totient is φ = 20918665144440.

The previous prime is 20927691697813. The next prime is 20927691697837. The reversal of 20927691697831 is 13879619672902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20927691697831 - 2⁵ = 20927691697799 is a prime.

It is a super-2 number, since 2×20927691697831² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20927691697837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50097616 + ... + 50513626.

It is an arithmetic number, because the mean of its divisors is an integer number (2617089890800).

Almost surely, 2^{20927691697831} is an apocalyptic number.

20927691697831 is a deficient number, since it is larger than the sum of its proper divisors (9027428569).

20927691697831 is a wasteful number, since it uses less digits than its factorization.

20927691697831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437589.

The product of its (nonzero) digits is 123451776, while the sum is 70.

The spelling of 20927691697831 in words is "twenty trillion, nine hundred twenty-seven billion, six hundred ninety-one million, six hundred ninety-seven thousand, eight hundred thirty-one".