1720320453 has 6 divisors (see below), whose sum is σ = 2484907334. Its totient is φ = 1146880296.

The previous prime is 1720320451. The next prime is 1720320463. The reversal of 1720320453 is 3540230271.

1720320453 is a `hidden beast` number, since 1 + 7 + 203 + 2 + 0 + 453 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1220663844 + 499656609 = 34938^2 + 22353^2 .

It is not a de Polignac number, because 1720320453 - 2¹ = 1720320451 is a prime.

It is a super-2 number, since 2×1720320453² = 5919004922020250418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720320451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95573350 + ... + 95573367.

Almost surely, 2^1720320453 is an apocalyptic number.

It is an amenable number.

1720320453 is a deficient number, since it is larger than the sum of its proper divisors (764586881).

1720320453 is a wasteful number, since it uses less digits than its factorization.

1720320453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191146723 (or 191146720 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 1720320453 is about 41476.7459307019. The cubic root of 1720320453 is about 1198.2196871279.

The spelling of 1720320453 in words is "one billion, seven hundred twenty million, three hundred twenty thousand, four hundred fifty-three".