20512801 has 4 divisors (see below), whose sum is σ = 20532100. Its totient is φ = 20493504.

The previous prime is 20512771. The next prime is 20512841. The reversal of 20512801 is 10821502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10821502 = 2 ⋅5410751.

It can be written as a sum of positive squares in 2 ways, for example, as 2322576 + 18190225 = 1524^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 20512801 - 2⁵ = 20512769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20512841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7956 + ... + 10213.

It is an arithmetic number, because the mean of its divisors is an integer number (5133025).

Almost surely, 2^20512801 is an apocalyptic number.

It is an amenable number.

20512801 is a deficient number, since it is larger than the sum of its proper divisors (19299).

20512801 is a wasteful number, since it uses less digits than its factorization.

20512801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19298.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 20512801 is about 4529.1059824208. The cubic root of 20512801 is about 273.7421384564.

The spelling of 20512801 in words is "twenty million, five hundred twelve thousand, eight hundred one".