72021020 has 24 divisors (see below), whose sum is σ = 159205200. Its totient is φ = 27292032.

The previous prime is 72021013. The next prime is 72021067. The reversal of 72021020 is 2012027.

It is a junction number, because it is equal to n+sod(n) for n = 72020986 and 72021004.

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, 94385 + ... + 95144.

It is an arithmetic number, because the mean of its divisors is an integer number (6633550).

Almost surely, 2^72021020 is an apocalyptic number.

It is an amenable number.

72021020 is an abundant number, since it is smaller than the sum of its proper divisors (87184180).

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

72021020 is a wasteful number, since it uses less digits than its factorization.

72021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189557 (or 189555 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 72021020 is about 8486.5198992284. The cubic root of 72021020 is about 416.0572452657.

Adding to 72021020 its reverse (2012027), we get a palindrome (74033047).

The spelling of 72021020 in words is "seventy-two million, twenty-one thousand, twenty".