20489655831 has 4 divisors (see below), whose sum is σ = 27319541112. Its totient is φ = 13659770552.

The previous prime is 20489655761. The next prime is 20489655833. The reversal of 20489655831 is 13855698402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20489655831 - 2²⁹ = 19952784919 is a prime.

It is a super-2 number, since 2×20489655831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489655833) 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 3 ways as a sum of consecutive naturals, for example, 3414942636 + ... + 3414942641.

It is an arithmetic number, because the mean of its divisors is an integer number (6829885278).

Almost surely, 2^20489655831 is an apocalyptic number.

20489655831 is a deficient number, since it is larger than the sum of its proper divisors (6829885281).

20489655831 is an equidigital number, since it uses as much as digits as its factorization.

20489655831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6829885280.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 20489655831 in words is "twenty billion, four hundred eighty-nine million, six hundred fifty-five thousand, eight hundred thirty-one".