20740109 has 4 divisors (see below), whose sum is σ = 22335516. Its totient is φ = 19144704.

The previous prime is 20740099. The next prime is 20740127. The reversal of 20740109 is 90104702.

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 11710084 + 9030025 = 3422^2 + 3005^2 .

It is a cyclic number.

It is not a de Polignac number, because 20740109 - 2⁸ = 20739853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20740189) 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, 797684 + ... + 797709.

It is an arithmetic number, because the mean of its divisors is an integer number (5583879).

Almost surely, 2^20740109 is an apocalyptic number.

It is an amenable number.

20740109 is a deficient number, since it is larger than the sum of its proper divisors (1595407).

20740109 is a wasteful number, since it uses less digits than its factorization.

20740109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595406.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 20740109 is about 4554.1309818669. The cubic root of 20740109 is about 274.7495637381.

The spelling of 20740109 in words is "twenty million, seven hundred forty thousand, one hundred nine".