1020320440 has 32 divisors (see below), whose sum is σ = 2301482160. Its totient is φ = 407104000.

The previous prime is 1020320429. The next prime is 1020320491. The reversal of 1020320440 is 440230201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15766 + ... + 47845.

Almost surely, 2^1020320440 is an apocalyptic number.

1020320440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020320440 is an abundant number, since it is smaller than the sum of its proper divisors (1281161720).

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

1020320440 is a wasteful number, since it uses less digits than its factorization.

1020320440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64023 (or 64019 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 1020320440 is about 31942.4551341941. The cubic root of 1020320440 is about 1006.7281110008.

Adding to 1020320440 its reverse (440230201), we get a palindrome (1460550641).

The spelling of 1020320440 in words is "one billion, twenty million, three hundred twenty thousand, four hundred forty".