20551771 has 8 divisors (see below), whose sum is σ = 20957120. Its totient is φ = 20150208.

The previous prime is 20551733. The next prime is 20551789. The reversal of 20551771 is 17715502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20551771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20551871) 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, 11575 + ... + 13231.

It is an arithmetic number, because the mean of its divisors is an integer number (2619640).

Almost surely, 2^20551771 is an apocalyptic number.

20551771 is a deficient number, since it is larger than the sum of its proper divisors (405349).

20551771 is a wasteful number, since it uses less digits than its factorization.

20551771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 20551771 is about 4533.4061146118. The cubic root of 20551771 is about 273.9153795913.

The spelling of 20551771 in words is "twenty million, five hundred fifty-one thousand, seven hundred seventy-one".