20617055 has 16 divisors (see below), whose sum is σ = 25540704. Its totient is φ = 15966720.

The previous prime is 20617049. The next prime is 20617127. The reversal of 20617055 is 55071602.

It is not a de Polignac number, because 20617055 - 2⁶ = 20616991 is a prime.

It is a congruent number.

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, 33107 + ... + 33723.

It is an arithmetic number, because the mean of its divisors is an integer number (1596294).

Almost surely, 2^20617055 is an apocalyptic number.

20617055 is a deficient number, since it is larger than the sum of its proper divisors (4923649).

20617055 is a wasteful number, since it uses less digits than its factorization.

20617055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 20617055 is about 4540.6007311808. The cubic root of 20617055 is about 274.2051095330.

Adding to 20617055 its reverse (55071602), we get a palindrome (75688657).

The spelling of 20617055 in words is "twenty million, six hundred seventeen thousand, fifty-five".