320120420403 has 16 divisors (see below), whose sum is σ = 487885848320. Its totient is φ = 182894715936.

The previous prime is 320120420387. The next prime is 320120420407. The reversal of 320120420403 is 304024021023.

It is not a de Polignac number, because 320120420403 - 2⁴ = 320120420387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320120420403.

It is not an unprimeable number, because it can be changed into a prime (320120420407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1175425 + ... + 1421922.

It is an arithmetic number, because the mean of its divisors is an integer number (30492865520).

Almost surely, 2^320120420403 is an apocalyptic number.

320120420403 is a deficient number, since it is larger than the sum of its proper divisors (167765427917).

320120420403 is a wasteful number, since it uses less digits than its factorization.

320120420403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2603226.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 320120420403 its reverse (304024021023), we get a palindrome (624144441426).

The spelling of 320120420403 in words is "three hundred twenty billion, one hundred twenty million, four hundred twenty thousand, four hundred three".