20123616 has 24 divisors (see below), whose sum is σ = 52824744. Its totient is φ = 6707840.

The previous prime is 20123611. The next prime is 20123617. The reversal of 20123616 is 61632102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 20123592 and 20123601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123611) 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, 104715 + ... + 104906.

It is an arithmetic number, because the mean of its divisors is an integer number (2201031).

Almost surely, 2^20123616 is an apocalyptic number.

It is an amenable number.

20123616 is an abundant number, since it is smaller than the sum of its proper divisors (32701128).

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

20123616 is a wasteful number, since it uses less digits than its factorization.

20123616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209634 (or 209626 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20123616 is about 4485.9353539702. The cubic root of 20123616 is about 271.9998558246. Note that the first 3 decimals are identical.

Adding to 20123616 its reverse (61632102), we get a palindrome (81755718).

The spelling of 20123616 in words is "twenty million, one hundred twenty-three thousand, six hundred sixteen".