20779201 has 4 divisors (see below), whose sum is σ = 20931012. Its totient is φ = 20627392.

The previous prime is 20779193. The next prime is 20779247. The reversal of 20779201 is 10297702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10297702 = 2 ⋅5148851.

It can be written as a sum of positive squares in 2 ways, for example, as 13359025 + 7420176 = 3655^2 + 2724^2 .

It is a cyclic number.

It is not a de Polignac number, because 20779201 - 2³ = 20779193 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 20779201.

It is not an unprimeable number, because it can be changed into a prime (20779001) 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, 75700 + ... + 75973.

It is an arithmetic number, because the mean of its divisors is an integer number (5232753).

Almost surely, 2^20779201 is an apocalyptic number.

It is an amenable number.

20779201 is a deficient number, since it is larger than the sum of its proper divisors (151811).

20779201 is a wasteful number, since it uses less digits than its factorization.

20779201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151810.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20779201 is about 4558.4208888605. The cubic root of 20779201 is about 274.9220759932.

The spelling of 20779201 in words is "twenty million, seven hundred seventy-nine thousand, two hundred one".