520023545 has 16 divisors (see below), whose sum is σ = 637628112. Its totient is φ = 406997760.

The previous prime is 520023533. The next prime is 520023547. The reversal of 520023545 is 545320025.

It can be written as a sum of positive squares in 8 ways, for example, as 19114384 + 500909161 = 4372^2 + 22381^2 .

It is not a de Polignac number, because 520023545 - 2¹⁸ = 519761401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520023547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96215 + ... + 101475.

It is an arithmetic number, because the mean of its divisors is an integer number (39851757).

Almost surely, 2^520023545 is an apocalyptic number.

It is an amenable number.

520023545 is a deficient number, since it is larger than the sum of its proper divisors (117604567).

520023545 is a wasteful number, since it uses less digits than its factorization.

520023545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5692.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 520023545 is about 22804.0247544156. The cubic root of 520023545 is about 804.1572884562.

The spelling of 520023545 in words is "five hundred twenty million, twenty-three thousand, five hundred forty-five".