721567052020 has 24 divisors (see below), whose sum is σ = 1533547328544. Its totient is φ = 285149388576.

The previous prime is 721567051981. The next prime is 721567052021. The reversal of 721567052020 is 20250765127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721567052021) 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, 217337814 + ... + 217341133.

It is an arithmetic number, because the mean of its divisors is an integer number (63897805356).

Almost surely, 2^721567052020 is an apocalyptic number.

It is an amenable number.

721567052020 is an abundant number, since it is smaller than the sum of its proper divisors (811980276524).

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

721567052020 is a wasteful number, since it uses less digits than its factorization.

721567052020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434679039 (or 434679037 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 37.

The spelling of 721567052020 in words is "seven hundred twenty-one billion, five hundred sixty-seven million, fifty-two thousand, twenty".