20123205532 has 24 divisors (see below), whose sum is σ = 36118317312. Its totient is φ = 9804774000.

The previous prime is 20123205437. The next prime is 20123205581. The reversal of 20123205532 is 23550232102.

It is a junction number, because it is equal to n+sod(n) for n = 20123205497 and 20123205506.

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, 61594 + ... + 209857.

It is an arithmetic number, because the mean of its divisors is an integer number (1504929888).

Almost surely, 2^20123205532 is an apocalyptic number.

It is an amenable number.

20123205532 is a deficient number, since it is larger than the sum of its proper divisors (15995111780).

20123205532 is a wasteful number, since it uses less digits than its factorization.

20123205532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271929 (or 271927 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 20123205532 its reverse (23550232102), we get a palindrome (43673437634).

The spelling of 20123205532 in words is "twenty billion, one hundred twenty-three million, two hundred five thousand, five hundred thirty-two".