20255518 has 4 divisors (see below), whose sum is σ = 30383280. Its totient is φ = 10127758.

The previous prime is 20255513. The next prime is 20255527. The reversal of 20255518 is 81555202.

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

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 polite number, since it can be written as a sum of consecutive naturals, namely, 5063878 + ... + 5063881.

It is an arithmetic number, because the mean of its divisors is an integer number (7595820).

Almost surely, 2^20255518 is an apocalyptic number.

20255518 is a deficient number, since it is larger than the sum of its proper divisors (10127762).

20255518 is a wasteful number, since it uses less digits than its factorization.

20255518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10127761.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 20255518 is about 4500.6130693496. The cubic root of 20255518 is about 272.5928443836.

The spelling of 20255518 in words is "twenty million, two hundred fifty-five thousand, five hundred eighteen".