20455555 has 8 divisors (see below), whose sum is σ = 24586992. Its totient is φ = 16337568.

The previous prime is 20455553. The next prime is 20455559. The reversal of 20455555 is 55555402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20455555 - 2¹ = 20455553 is a prime.

It is a Duffinian number.

20455555 is a modest number, since divided by 5555 gives 2045 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20455553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364 + ... + 6406.

It is an arithmetic number, because the mean of its divisors is an integer number (3073374).

Almost surely, 2^20455555 is an apocalyptic number.

20455555 is a deficient number, since it is larger than the sum of its proper divisors (4131437).

20455555 is an equidigital number, since it uses as much as digits as its factorization.

20455555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6725.

The product of its (nonzero) digits is 25000, while the sum is 31.

The square root of 20455555 is about 4522.7817767387. The cubic root of 20455555 is about 273.4872530202.

The spelling of 20455555 in words is "twenty million, four hundred fifty-five thousand, five hundred fifty-five".