1020020321 has 4 divisors (see below), whose sum is σ = 1020182532. Its totient is φ = 1019858112.

The previous prime is 1020020303. The next prime is 1020020333. The reversal of 1020020321 is 1230200201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 335622400 + 684397921 = 18320^2 + 26161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020020321 - 2¹⁴ = 1020003937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1020020381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71276 + ... + 84381.

It is an arithmetic number, because the mean of its divisors is an integer number (255045633).

Almost surely, 2^1020020321 is an apocalyptic number.

It is an amenable number.

1020020321 is a deficient number, since it is larger than the sum of its proper divisors (162211).

1020020321 is an equidigital number, since it uses as much as digits as its factorization.

1020020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162210.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1020020321 is about 31937.7569813536. The cubic root of 1020020321 is about 1006.6293943458.

Adding to 1020020321 its reverse (1230200201), we get a palindrome (2250220522).

The spelling of 1020020321 in words is "one billion, twenty million, twenty thousand, three hundred twenty-one".