20255919 has 16 divisors (see below), whose sum is σ = 29038080. Its totient is φ = 12519360.

The previous prime is 20255903. The next prime is 20255933. The reversal of 20255919 is 91955202.

It is not a de Polignac number, because 20255919 - 2⁴ = 20255903 is a prime.

It is a super-2 number, since 2×20255919² = 820604509069122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20255919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20255999) 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 15 ways as a sum of consecutive naturals, for example, 1102 + ... + 6459.

It is an arithmetic number, because the mean of its divisors is an integer number (1814880).

Almost surely, 2^20255919 is an apocalyptic number.

20255919 is a deficient number, since it is larger than the sum of its proper divisors (8782161).

20255919 is a wasteful number, since it uses less digits than its factorization.

20255919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7630.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 20255919 is about 4500.6576186153. The cubic root of 20255919 is about 272.5946432187.

The spelling of 20255919 in words is "twenty million, two hundred fifty-five thousand, nine hundred nineteen".