20205534 has 8 divisors (see below), whose sum is σ = 40411080. Its totient is φ = 6735176.

The previous prime is 20205533. The next prime is 20205541. The reversal of 20205534 is 43550202.

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

20205534 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 20205534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205533) 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, 1683789 + ... + 1683800.

It is an arithmetic number, because the mean of its divisors is an integer number (5051385).

Almost surely, 2^20205534 is an apocalyptic number.

20205534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20205534 is a wasteful number, since it uses less digits than its factorization.

20205534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367594.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20205534 is about 4495.0566181084. The cubic root of 20205534 is about 272.3684363367.

Adding to 20205534 its reverse (43550202), we get a palindrome (63755736).

The spelling of 20205534 in words is "twenty million, two hundred five thousand, five hundred thirty-four".