20551017 has 4 divisors (see below), whose sum is σ = 27401360. Its totient is φ = 13700676.

The previous prime is 20551007. The next prime is 20551019. The reversal of 20551017 is 71015502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20551017 - 2⁴ = 20551001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20550984 and 20551002.

It is not an unprimeable number, because it can be changed into a prime (20551019) 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 3 ways as a sum of consecutive naturals, for example, 3425167 + ... + 3425172.

It is an arithmetic number, because the mean of its divisors is an integer number (6850340).

Almost surely, 2^20551017 is an apocalyptic number.

It is an amenable number.

20551017 is a deficient number, since it is larger than the sum of its proper divisors (6850343).

20551017 is an equidigital number, since it uses as much as digits as its factorization.

20551017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6850342.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 20551017 is about 4533.3229534195. The cubic root of 20551017 is about 273.9120297628.

Adding to 20551017 its reverse (71015502), we get a palindrome (91566519).

The spelling of 20551017 in words is "twenty million, five hundred fifty-one thousand, seventeen".