20403023312 has 240 divisors, whose sum is σ = 49177245312. Its totient is φ = 8025937920.

The previous prime is 20403023309. The next prime is 20403023321. The reversal of 20403023312 is 21332030402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 304522703 + ... + 304522769.

Almost surely, 2^20403023312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20403023312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24588622656).

20403023312 is an abundant number, since it is smaller than the sum of its proper divisors (28774222000).

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

20403023312 is a wasteful number, since it uses less digits than its factorization.

20403023312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20403023312 its reverse (21332030402), we get a palindrome (41735053714).

The spelling of 20403023312 in words is "twenty billion, four hundred three million, twenty-three thousand, three hundred twelve".