18820395870031 has 16 divisors (see below), whose sum is σ = 21878615232000. Its totient is φ = 15854700145248.

The previous prime is 18820395870019. The next prime is 18820395870037. The reversal of 18820395870031 is 13007859302881.

It is a cyclic number.

It is not a de Polignac number, because 18820395870031 - 2⁷ = 18820395869903 is a prime.

It is a super-2 number, since 2×18820395870031² (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 (18820395870037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3442995 + ... + 7035268.

It is an arithmetic number, because the mean of its divisors is an integer number (1367413452000).

Almost surely, 2^{18820395870031} is an apocalyptic number.

18820395870031 is a deficient number, since it is larger than the sum of its proper divisors (3058219361969).

18820395870031 is a wasteful number, since it uses less digits than its factorization.

18820395870031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10482678.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 18820395870031 in words is "eighteen trillion, eight hundred twenty billion, three hundred ninety-five million, eight hundred seventy thousand, thirty-one".