20628871 has 8 divisors (see below), whose sum is σ = 21892464. Its totient is φ = 19370880.

The previous prime is 20628859. The next prime is 20628887. The reversal of 20628871 is 17882602.

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 20628871 - 2⁷ = 20628743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20628821) 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, 8076 + ... + 10318.

It is an arithmetic number, because the mean of its divisors is an integer number (2736558).

Almost surely, 2^20628871 is an apocalyptic number.

20628871 is a deficient number, since it is larger than the sum of its proper divisors (1263593).

20628871 is a wasteful number, since it uses less digits than its factorization.

20628871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 20628871 is about 4541.9016942246. The cubic root of 20628871 is about 274.2574834665.

The spelling of 20628871 in words is "twenty million, six hundred twenty-eight thousand, eight hundred seventy-one".