20552555 has 8 divisors (see below), whose sum is σ = 24793344. Its totient is φ = 16355200.

The previous prime is 20552549. The next prime is 20552557. The reversal of 20552555 is 55525502.

It is a happy number.

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

It is not a de Polignac number, because 20552555 - 2⁶ = 20552491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20552557) 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, 9806 + ... + 11715.

It is an arithmetic number, because the mean of its divisors is an integer number (3099168).

Almost surely, 2^20552555 is an apocalyptic number.

20552555 is a deficient number, since it is larger than the sum of its proper divisors (4240789).

20552555 is a wasteful number, since it uses less digits than its factorization.

20552555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21717.

The product of its (nonzero) digits is 12500, while the sum is 29.

The square root of 20552555 is about 4533.4925829872. The cubic root of 20552555 is about 273.9188626151.

It can be divided in two parts, 2055 and 2555, that multiplied together give a palindrome (5250525).

The spelling of 20552555 in words is "twenty million, five hundred fifty-two thousand, five hundred fifty-five".