20552505 has 16 divisors (see below), whose sum is σ = 32944704. Its totient is φ = 10941120.

The previous prime is 20552491. The next prime is 20552513. The reversal of 20552505 is 50525502.

It is not a de Polignac number, because 20552505 - 2⁸ = 20552249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10935 + ... + 12675.

It is an arithmetic number, because the mean of its divisors is an integer number (2059044).

Almost surely, 2^20552505 is an apocalyptic number.

It is an amenable number.

20552505 is a deficient number, since it is larger than the sum of its proper divisors (12392199).

20552505 is a wasteful number, since it uses less digits than its factorization.

20552505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536.

The product of its (nonzero) digits is 2500, while the sum is 24.

The square root of 20552505 is about 4533.4870684717. The cubic root of 20552505 is about 273.9186404862.

It can be divided in two parts, 2055 and 2505, that added together give a triangular number (4560 = T₉₅).

The spelling of 20552505 in words is "twenty million, five hundred fifty-two thousand, five hundred five".