20534405 has 8 divisors (see below), whose sum is σ = 24744984. Its totient is φ = 16358400.

The previous prime is 20534387. The next prime is 20534413. The reversal of 20534405 is 50443502.

It can be written as a sum of positive squares in 4 ways, for example, as 8375236 + 12159169 = 2894^2 + 3487^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20534405 - 2⁶ = 20534341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7316 + ... + 9725.

It is an arithmetic number, because the mean of its divisors is an integer number (3093123).

Almost surely, 2^20534405 is an apocalyptic number.

It is an amenable number.

20534405 is a deficient number, since it is larger than the sum of its proper divisors (4210579).

20534405 is a wasteful number, since it uses less digits than its factorization.

20534405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17287.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20534405 is about 4531.4903729347. The cubic root of 20534405 is about 273.8382061135.

Adding to 20534405 its reverse (50443502), we get a palindrome (70977907).

The spelling of 20534405 in words is "twenty million, five hundred thirty-four thousand, four hundred five".