20741009 has 8 divisors (see below), whose sum is σ = 21695040. Its totient is φ = 19791376.

The previous prime is 20740999. The next prime is 20741029. The reversal of 20741009 is 90014702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20741009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20741029) 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, 12002 + ... + 13620.

It is an arithmetic number, because the mean of its divisors is an integer number (2711880).

Almost surely, 2^20741009 is an apocalyptic number.

It is an amenable number.

20741009 is a deficient number, since it is larger than the sum of its proper divisors (954031).

20741009 is a wasteful number, since it uses less digits than its factorization.

20741009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199.

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

The square root of 20741009 is about 4554.2297921822. The cubic root of 20741009 is about 274.7535378579.

The spelling of 20741009 in words is "twenty million, seven hundred forty-one thousand, nine".