20620069 has 4 divisors (see below), whose sum is σ = 20665260. Its totient is φ = 20574880.

The previous prime is 20620051. The next prime is 20620079. The reversal of 20620069 is 96002602.

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 11390625 + 9229444 = 3375^2 + 3038^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620069 - 2⁵ = 20620037 is a prime.

It is a super-2 number, since 2×20620069² = 850374491129522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620049) 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, 21904 + ... + 22825.

It is an arithmetic number, because the mean of its divisors is an integer number (5166315).

Almost surely, 2^20620069 is an apocalyptic number.

It is an amenable number.

20620069 is a deficient number, since it is larger than the sum of its proper divisors (45191).

20620069 is an equidigital number, since it uses as much as digits as its factorization.

20620069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45190.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20620069 is about 4540.9326134617. The cubic root of 20620069 is about 274.2184708647.

The spelling of 20620069 in words is "twenty million, six hundred twenty thousand, sixty-nine".