20123220432 has 60 divisors (see below), whose sum is σ = 60472337856. Its totient is φ = 5749490880.

The previous prime is 20123220431. The next prime is 20123220499. The reversal of 20123220432 is 23402232102.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20123220399 and 20123220408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123220431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4275544 + ... + 4280247.

Almost surely, 2^20123220432 is an apocalyptic number.

It is an amenable number.

20123220432 is an abundant number, since it is smaller than the sum of its proper divisors (40349117424).

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

20123220432 is a wasteful number, since it uses less digits than its factorization.

20123220432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8555816 (or 8555803 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20123220432 its reverse (23402232102), we get a palindrome (43525452534).

The spelling of 20123220432 in words is "twenty billion, one hundred twenty-three million, two hundred twenty thousand, four hundred thirty-two".