20534401 has 4 divisors (see below), whose sum is σ = 20722900. Its totient is φ = 20345904.

The previous prime is 20534387. The next prime is 20534413. The reversal of 20534401 is 10443502.

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 17977600 + 2556801 = 4240^2 + 1599^2 .

It is a cyclic number.

It is not a de Polignac number, because 20534401 - 2⁷ = 20534273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20534461) 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, 94086 + ... + 94303.

It is an arithmetic number, because the mean of its divisors is an integer number (5180725).

Almost surely, 2^20534401 is an apocalyptic number.

It is an amenable number.

20534401 is a deficient number, since it is larger than the sum of its proper divisors (188499).

20534401 is a wasteful number, since it uses less digits than its factorization.

20534401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188498.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20534401 is about 4531.4899315788. The cubic root of 20534401 is about 273.8381883327.

Adding to 20534401 its reverse (10443502), we get a palindrome (30977903).

The spelling of 20534401 in words is "twenty million, five hundred thirty-four thousand, four hundred one".