20819831137 has 24 divisors (see below), whose sum is σ = 24538078656. Its totient is φ = 17610935328.

The previous prime is 20819831113. The next prime is 20819831141. The reversal of 20819831137 is 73113891802.

It is not a de Polignac number, because 20819831137 - 2²⁷ = 20685613409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20819831093 and 20819831102.

It is not an unprimeable number, because it can be changed into a prime (20819861137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4540548 + ... + 4545130.

It is an arithmetic number, because the mean of its divisors is an integer number (1022419944).

Almost surely, 2^20819831137 is an apocalyptic number.

It is an amenable number.

20819831137 is a deficient number, since it is larger than the sum of its proper divisors (3718247519).

20819831137 is a wasteful number, since it uses less digits than its factorization.

20819831137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5797 (or 5790 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 20819831137 in words is "twenty billion, eight hundred nineteen million, eight hundred thirty-one thousand, one hundred thirty-seven".