20848739 has 4 divisors (see below), whose sum is σ = 20875320. Its totient is φ = 20822160.

The previous prime is 20848733. The next prime is 20848753. The reversal of 20848739 is 93784802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20848739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20848696 and 20848705.

It is not an unprimeable number, because it can be changed into a prime (20848733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12077 + ... + 13694.

It is an arithmetic number, because the mean of its divisors is an integer number (5218830).

Almost surely, 2^20848739 is an apocalyptic number.

20848739 is a deficient number, since it is larger than the sum of its proper divisors (26581).

20848739 is an equidigital number, since it uses as much as digits as its factorization.

20848739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26580.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 20848739 is about 4566.0419402366. The cubic root of 20848739 is about 275.2284118840.

The spelling of 20848739 in words is "twenty million, eight hundred forty-eight thousand, seven hundred thirty-nine".