20740389 has 8 divisors (see below), whose sum is σ = 27922752. Its totient is φ = 13692480.

The previous prime is 20740373. The next prime is 20740397. The reversal of 20740389 is 98304702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20740389 - 2⁴ = 20740373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20740399) 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 7 ways as a sum of consecutive naturals, for example, 33252 + ... + 33869.

It is an arithmetic number, because the mean of its divisors is an integer number (3490344).

Almost surely, 2^20740389 is an apocalyptic number.

It is an amenable number.

20740389 is a deficient number, since it is larger than the sum of its proper divisors (7182363).

20740389 is a wasteful number, since it uses less digits than its factorization.

20740389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67227.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20740389 is about 4554.1617230836. The cubic root of 20740389 is about 274.7508001433.

The spelling of 20740389 in words is "twenty million, seven hundred forty thousand, three hundred eighty-nine".