20617995 has 8 divisors (see below), whose sum is σ = 32988816. Its totient is φ = 10996256.

The previous prime is 20617981. The next prime is 20617999. The reversal of 20617995 is 59971602.

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 20617995 - 2⁶ = 20617931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20617999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687252 + ... + 687281.

It is an arithmetic number, because the mean of its divisors is an integer number (4123602).

Almost surely, 2^20617995 is an apocalyptic number.

20617995 is a deficient number, since it is larger than the sum of its proper divisors (12370821).

20617995 is a wasteful number, since it uses less digits than its factorization.

20617995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374541.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 20617995 is about 4540.7042405336. The cubic root of 20617995 is about 274.2092767768.

It can be divided in two parts, 20617 and 995, that added together give a palindrome (21612).

The spelling of 20617995 in words is "twenty million, six hundred seventeen thousand, nine hundred ninety-five".