20744889 has 32 divisors (see below), whose sum is σ = 31881600. Its totient is φ = 11880960.

The previous prime is 20744863. The next prime is 20744891. The reversal of 20744889 is 98844702.

It is not a de Polignac number, because 20744889 - 2⁹ = 20744377 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20744889.

It is not an unprimeable number, because it can be changed into a prime (20744809) 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 31 ways as a sum of consecutive naturals, for example, 50517 + ... + 50925.

It is an arithmetic number, because the mean of its divisors is an integer number (996300).

Almost surely, 2^20744889 is an apocalyptic number.

20744889 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20744889 is a deficient number, since it is larger than the sum of its proper divisors (11136711).

20744889 is a wasteful number, since it uses less digits than its factorization.

20744889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 20744889 is about 4554.6557498893. The cubic root of 20744889 is about 274.7706694137.

The spelling of 20744889 in words is "twenty million, seven hundred forty-four thousand, eight hundred eighty-nine".