20255519 has 4 divisors (see below), whose sum is σ = 20540880. Its totient is φ = 19970160.

The previous prime is 20255513. The next prime is 20255527. The reversal of 20255519 is 91555202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91555202 = 2 ⋅45777601.

It is a cyclic number.

It is not a de Polignac number, because 20255519 - 2²⁴ = 3478303 is a prime.

It is a super-2 number, since 2×20255519² = 820572099918722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20255491 and 20255500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20255513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142574 + ... + 142715.

It is an arithmetic number, because the mean of its divisors is an integer number (5135220).

Almost surely, 2^20255519 is an apocalyptic number.

20255519 is a deficient number, since it is larger than the sum of its proper divisors (285361).

20255519 is an equidigital number, since it uses as much as digits as its factorization.

20255519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285360.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 20255519 is about 4500.6131804455. The cubic root of 20255519 is about 272.5928488695.

The spelling of 20255519 in words is "twenty million, two hundred fifty-five thousand, five hundred nineteen".