20520259 has 4 divisors (see below), whose sum is σ = 20868120. Its totient is φ = 20172400.

The previous prime is 20520257. The next prime is 20520263. The reversal of 20520259 is 95202502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20520259 - 2¹ = 20520257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20520257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173842 + ... + 173959.

It is an arithmetic number, because the mean of its divisors is an integer number (5217030).

Almost surely, 2^20520259 is an apocalyptic number.

20520259 is a deficient number, since it is larger than the sum of its proper divisors (347861).

20520259 is an equidigital number, since it uses as much as digits as its factorization.

20520259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347860.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 20520259 is about 4529.9292488956. The cubic root of 20520259 is about 273.7753099622.

The spelling of 20520259 in words is "twenty million, five hundred twenty thousand, two hundred fifty-nine".