20709001 has 4 divisors (see below), whose sum is σ = 20872192. Its totient is φ = 20545812.

The previous prime is 20708971. The next prime is 20709041. The reversal of 20709001 is 10090702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20709001 - 2⁵ = 20708969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20709001.

It is not an unprimeable number, because it can be changed into a prime (20709041) 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, 81405 + ... + 81658.

It is an arithmetic number, because the mean of its divisors is an integer number (5218048).

Almost surely, 2^20709001 is an apocalyptic number.

It is an amenable number.

20709001 is a deficient number, since it is larger than the sum of its proper divisors (163191).

20709001 is a wasteful number, since it uses less digits than its factorization.

20709001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163190.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 20709001 is about 4550.7143395296. The cubic root of 20709001 is about 274.6121297746.

Adding to 20709001 its reverse (10090702), we get a palindrome (30799703).

The spelling of 20709001 in words is "twenty million, seven hundred nine thousand, one".