321000020 has 24 divisors (see below), whose sum is σ = 735382368. Its totient is φ = 116727200.

The previous prime is 321000011. The next prime is 321000023. The reversal of 321000020 is 20000123.

It is a junction number, because it is equal to n+sod(n) for n = 320999971 and 321000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321000023) 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, 729326 + ... + 729765.

It is an arithmetic number, because the mean of its divisors is an integer number (30640932).

Almost surely, 2^321000020 is an apocalyptic number.

It is an amenable number.

321000020 is an abundant number, since it is smaller than the sum of its proper divisors (414382348).

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

321000020 is a wasteful number, since it uses less digits than its factorization.

321000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459111 (or 1459109 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 321000020 is about 17916.4734253145. The cubic root of 321000020 is about 684.7021419774.

Adding to 321000020 its reverse (20000123), we get a palindrome (341000143).

The spelling of 321000020 in words is "three hundred twenty-one million, twenty", and thus it is an aban number.