20888739 has 8 divisors (see below), whose sum is σ = 30946320. Its totient is φ = 13925808.

The previous prime is 20888723. The next prime is 20888741. The reversal of 20888739 is 93788802.

It is not a de Polignac number, because 20888739 - 2⁴ = 20888723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20888694 and 20888703.

It is not an unprimeable number, because it can be changed into a prime (20888759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386802 + ... + 386855.

It is an arithmetic number, because the mean of its divisors is an integer number (3868290).

Almost surely, 2^20888739 is an apocalyptic number.

20888739 is a deficient number, since it is larger than the sum of its proper divisors (10057581).

20888739 is an equidigital number, since it uses as much as digits as its factorization.

20888739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773666 (or 773660 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 20888739 is about 4570.4200025818. The cubic root of 20888739 is about 275.4043154615.

The spelling of 20888739 in words is "twenty million, eight hundred eighty-eight thousand, seven hundred thirty-nine".