1020320123 has 4 divisors (see below), whose sum is σ = 1020434688. Its totient is φ = 1020205560.

The previous prime is 1020320117. The next prime is 1020320131. The reversal of 1020320123 is 3210230201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3210230201 = 701 ⋅4579501.

It is a cyclic number.

It is not a de Polignac number, because 1020320123 - 2⁴ = 1020320107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020320098 and 1020320107.

It is not an unprimeable number, because it can be changed into a prime (1020320113) 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, 42683 + ... + 62148.

It is an arithmetic number, because the mean of its divisors is an integer number (255108672).

Almost surely, 2^1020320123 is an apocalyptic number.

1020320123 is a deficient number, since it is larger than the sum of its proper divisors (114565).

1020320123 is an equidigital number, since it uses as much as digits as its factorization.

1020320123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114564.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1020320123 is about 31942.4501721455. The cubic root of 1020320123 is about 1006.7280067418.

Adding to 1020320123 its reverse (3210230201), we get a palindrome (4230550324).

The spelling of 1020320123 in words is "one billion, twenty million, three hundred twenty thousand, one hundred twenty-three".