1720081520 has 40 divisors (see below), whose sum is σ = 4002467040. Its totient is φ = 687468800.

The previous prime is 1720081507. The next prime is 1720081537. The reversal of 1720081520 is 251800271.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1720081520.

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, 97370 + ... + 113670.

It is an arithmetic number, because the mean of its divisors is an integer number (100061676).

Almost surely, 2^1720081520 is an apocalyptic number.

1720081520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720081520 is an abundant number, since it is smaller than the sum of its proper divisors (2282385520).

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

1720081520 is a wasteful number, since it uses less digits than its factorization.

1720081520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17633 (or 17627 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 1720081520 is about 41473.8655058821. The cubic root of 1720081520 is about 1198.1642115179.

Adding to 1720081520 its reverse (251800271), we get a palindrome (1971881791).

The spelling of 1720081520 in words is "one billion, seven hundred twenty million, eighty-one thousand, five hundred twenty".