581391360020 has 24 divisors (see below), whose sum is σ = 1221020390184. Its totient is φ = 232537775616.

The previous prime is 581391360019. The next prime is 581391360047. The reversal of 581391360020 is 20063193185.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41392716304 + 539998643716 = 203452^2 + 734846^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 917657 + ... + 1415936.

It is an arithmetic number, because the mean of its divisors is an integer number (50875849591).

Almost surely, 2^581391360020 is an apocalyptic number.

It is an amenable number.

581391360020 is an abundant number, since it is smaller than the sum of its proper divisors (639629030164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

581391360020 is a wasteful number, since it uses less digits than its factorization.

581391360020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346059 (or 2346057 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 581391360020 in words is "five hundred eighty-one billion, three hundred ninety-one million, three hundred sixty thousand, twenty".