20340534 has 16 divisors (see below), whose sum is σ = 43074288. Its totient is φ = 6381312.

The previous prime is 20340521. The next prime is 20340539. The reversal of 20340534 is 43504302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20340534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99607 + ... + 99810.

It is an arithmetic number, because the mean of its divisors is an integer number (2692143).

Almost surely, 2^20340534 is an apocalyptic number.

20340534 is an abundant number, since it is smaller than the sum of its proper divisors (22733754).

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

20340534 is a wasteful number, since it uses less digits than its factorization.

20340534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199439.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20340534 is about 4510.0481150427. The cubic root of 20340534 is about 272.9736855582.

Adding to 20340534 its reverse (43504302), we get a palindrome (63844836).

The spelling of 20340534 in words is "twenty million, three hundred forty thousand, five hundred thirty-four".