20455201 has 4 divisors (see below), whose sum is σ = 22028692. Its totient is φ = 18881712.

The previous prime is 20455181. The next prime is 20455207. The reversal of 20455201 is 10255402.

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 13690000 + 6765201 = 3700^2 + 2601^2 .

It is a cyclic number.

It is not a de Polignac number, because 20455201 - 2²¹ = 18358049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20455207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 786726 + ... + 786751.

It is an arithmetic number, because the mean of its divisors is an integer number (5507173).

Almost surely, 2^20455201 is an apocalyptic number.

It is an amenable number.

20455201 is a deficient number, since it is larger than the sum of its proper divisors (1573491).

20455201 is a wasteful number, since it uses less digits than its factorization.

20455201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573490.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20455201 is about 4522.7426413626. The cubic root of 20455201 is about 273.4856753714.

The spelling of 20455201 in words is "twenty million, four hundred fifty-five thousand, two hundred one".