20115534 has 16 divisors (see below), whose sum is σ = 40284288. Its totient is φ = 6696312.

The previous prime is 20115527. The next prime is 20115553. The reversal of 20115534 is 43551102.

It is a self number, because there is not a number n which added to its sum of digits gives 20115534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4069 + ... + 7535.

It is an arithmetic number, because the mean of its divisors is an integer number (2517768).

Almost surely, 2^20115534 is an apocalyptic number.

20115534 is an abundant number, since it is smaller than the sum of its proper divisors (20168754).

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

20115534 is a wasteful number, since it uses less digits than its factorization.

20115534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20115534 is about 4485.0344480282. The cubic root of 20115534 is about 271.9634376316.

Adding to 20115534 its reverse (43551102), we get a palindrome (63666636).

The spelling of 20115534 in words is "twenty million, one hundred fifteen thousand, five hundred thirty-four".