20208769 has 8 divisors (see below), whose sum is σ = 23312448. Its totient is φ = 17159280.

The previous prime is 20208719. The next prime is 20208781. The reversal of 20208769 is 96780202.

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

It is a cyclic number.

It is not a de Polignac number, because 20208769 - 2⁷ = 20208641 is a prime.

It is a super-2 number, since 2×20208769² = 816788688990722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20208719) 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, 12742 + ... + 14239.

It is an arithmetic number, because the mean of its divisors is an integer number (2914056).

Almost surely, 2^20208769 is an apocalyptic number.

It is an amenable number.

20208769 is a deficient number, since it is larger than the sum of its proper divisors (3103679).

20208769 is a wasteful number, since it uses less digits than its factorization.

20208769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27095.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20208769 is about 4495.4164434455. The cubic root of 20208769 is about 272.3829713789.

The spelling of 20208769 in words is "twenty million, two hundred eight thousand, seven hundred sixty-nine".