20255556 has 12 divisors (see below), whose sum is σ = 47262992. Its totient is φ = 6751848.

The previous prime is 20255549. The next prime is 20255563. The reversal of 20255556 is 65555202.

It is an interprime number because it is at equal distance from previous prime (20255549) and next prime (20255563).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843970 + ... + 843993.

Almost surely, 2^20255556 is an apocalyptic number.

It is an amenable number.

20255556 is an abundant number, since it is smaller than the sum of its proper divisors (27007436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20255556 is a wasteful number, since it uses less digits than its factorization.

20255556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687970 (or 1687968 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The square root of 20255556 is about 4500.6172909946. The cubic root of 20255556 is about 272.5930148478.

The spelling of 20255556 in words is "twenty million, two hundred fifty-five thousand, five hundred fifty-six".