20740889 has 4 divisors (see below), whose sum is σ = 22336356. Its totient is φ = 19145424.

The previous prime is 20740877. The next prime is 20740903. The reversal of 20740889 is 98804702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13542400 + 7198489 = 3680^2 + 2683^2 .

It is a cyclic number.

It is not a de Polignac number, because 20740889 - 2⁴ = 20740873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20740849) 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, 797714 + ... + 797739.

It is an arithmetic number, because the mean of its divisors is an integer number (5584089).

Almost surely, 2^20740889 is an apocalyptic number.

It is an amenable number.

20740889 is a deficient number, since it is larger than the sum of its proper divisors (1595467).

20740889 is a wasteful number, since it uses less digits than its factorization.

20740889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595466.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20740889 is about 4554.2166175974. The cubic root of 20740889 is about 274.7530079819.

The spelling of 20740889 in words is "twenty million, seven hundred forty thousand, eight hundred eighty-nine".