20011001312 has 48 divisors (see below), whose sum is σ = 41129272800. Its totient is φ = 9571806720.

The previous prime is 20011001273. The next prime is 20011001347. The reversal of 20011001312 is 21310011002.

It is a junction number, because it is equal to n+sod(n) for n = 20011001293 and 20011001302.

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, 2237 + ... + 200067.

It is an arithmetic number, because the mean of its divisors is an integer number (856859850).

Almost surely, 2^20011001312 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 20011001312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20564636400).

20011001312 is an abundant number, since it is smaller than the sum of its proper divisors (21118271488).

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

20011001312 is a wasteful number, since it uses less digits than its factorization.

20011001312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197979 (or 197971 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20011001312 its reverse (21310011002), we get a palindrome (41321012314).

The spelling of 20011001312 in words is "twenty billion, eleven million, one thousand, three hundred twelve".