1720540240 has 20 divisors (see below), whose sum is σ = 4000256244. Its totient is φ = 688216064.

The previous prime is 1720540223. The next prime is 1720540259. The reversal of 1720540240 is 420450271.

It can be written as a sum of positive squares in 2 ways, for example, as 973939264 + 746600976 = 31208^2 + 27324^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10753297 + ... + 10753456.

Almost surely, 2^1720540240 is an apocalyptic number.

1720540240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1720540240 is an abundant number, since it is smaller than the sum of its proper divisors (2279716004).

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

1720540240 is a wasteful number, since it uses less digits than its factorization.

1720540240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21506766 (or 21506760 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 1720540240 is about 41479.3953668565. The cubic root of 1720540240 is about 1198.2707128725.

The spelling of 1720540240 in words is "one billion, seven hundred twenty million, five hundred forty thousand, two hundred forty".