20401043312 has 80 divisors (see below), whose sum is σ = 43017788352. Its totient is φ = 9316823040.

The previous prime is 20401043303. The next prime is 20401043317. The reversal of 20401043312 is 21334010402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401043317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8370158 + ... + 8372594.

Almost surely, 2^20401043312 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 20401043312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21508894176).

20401043312 is an abundant number, since it is smaller than the sum of its proper divisors (22616745040).

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

20401043312 is a wasteful number, since it uses less digits than its factorization.

20401043312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866 (or 2860 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20401043312 its reverse (21334010402), we get a palindrome (41735053714).

The spelling of 20401043312 in words is "twenty billion, four hundred one million, forty-three thousand, three hundred twelve".