1320023540 has 48 divisors (see below), whose sum is σ = 3054046464. Its totient is φ = 475248000.

The previous prime is 1320023539. The next prime is 1320023543. The reversal of 1320023540 is 453200231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320023543) 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, 7484 + ... + 51923.

It is an arithmetic number, because the mean of its divisors is an integer number (63625968).

Almost surely, 2^1320023540 is an apocalyptic number.

1320023540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320023540 is an abundant number, since it is smaller than the sum of its proper divisors (1734022924).

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

1320023540 is a wasteful number, since it uses less digits than its factorization.

1320023540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59528 (or 59526 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 1320023540 is about 36332.1282063135. The cubic root of 1320023540 is about 1096.9678312733.

Adding to 1320023540 its reverse (453200231), we get a palindrome (1773223771).

The spelling of 1320023540 in words is "one billion, three hundred twenty million, twenty-three thousand, five hundred forty".