20748871 has 16 divisors (see below), whose sum is σ = 24504480. Its totient is φ = 17320320.

The previous prime is 20748853. The next prime is 20748877. The reversal of 20748871 is 17884702.

It is a cyclic number.

It is not a de Polignac number, because 20748871 - 2⁵ = 20748839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20748871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20748877) 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 15 ways as a sum of consecutive naturals, for example, 53145 + ... + 53533.

It is an arithmetic number, because the mean of its divisors is an integer number (1531530).

Almost surely, 2^20748871 is an apocalyptic number.

20748871 is a deficient number, since it is larger than the sum of its proper divisors (3755609).

20748871 is a wasteful number, since it uses less digits than its factorization.

20748871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 20748871 is about 4555.0928640369. The cubic root of 20748871 is about 274.7882491142.

The spelling of 20748871 in words is "twenty million, seven hundred forty-eight thousand, eight hundred seventy-one".