20748831 has 4 divisors (see below), whose sum is σ = 27665112. Its totient is φ = 13832552.

The previous prime is 20748821. The next prime is 20748839. The reversal of 20748831 is 13884702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20748831 - 2⁹ = 20748319 is a prime.

It is a super-2 number, since 2×20748831² = 861027975733122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20748792 and 20748801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20748839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3458136 + ... + 3458141.

It is an arithmetic number, because the mean of its divisors is an integer number (6916278).

Almost surely, 2^20748831 is an apocalyptic number.

20748831 is a deficient number, since it is larger than the sum of its proper divisors (6916281).

20748831 is an equidigital number, since it uses as much as digits as its factorization.

20748831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6916280.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 20748831 is about 4555.0884733449. The cubic root of 20748831 is about 274.7880725337.

The spelling of 20748831 in words is "twenty million, seven hundred forty-eight thousand, eight hundred thirty-one".