20123534 has 16 divisors (see below), whose sum is σ = 30841776. Its totient is φ = 9844800.

The previous prime is 20123513. The next prime is 20123539. The reversal of 20123534 is 43532102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33989 + ... + 34575.

It is an arithmetic number, because the mean of its divisors is an integer number (1927611).

Almost surely, 2^20123534 is an apocalyptic number.

20123534 is a deficient number, since it is larger than the sum of its proper divisors (10718242).

20123534 is a wasteful number, since it uses less digits than its factorization.

20123534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20123534 is about 4485.9262142840. The cubic root of 20123534 is about 271.9994863745. Note that the first 3 decimals are identical.

Adding to 20123534 its reverse (43532102), we get a palindrome (63655636).

The spelling of 20123534 in words is "twenty million, one hundred twenty-three thousand, five hundred thirty-four".