20012211312 has 160 divisors (see below), whose sum is σ = 55562396160. Its totient is φ = 6190525440.

The previous prime is 20012211281. The next prime is 20012211347. The reversal of 20012211312 is 21311221002.

It is a super-2 number, since 2×20012211312² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20012211291 and 20012211300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28225614 + ... + 28226322.

It is an arithmetic number, because the mean of its divisors is an integer number (347264976).

Almost surely, 2^20012211312 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 20012211312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27781198080).

20012211312 is an abundant number, since it is smaller than the sum of its proper divisors (35550184848).

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

20012211312 is a wasteful number, since it uses less digits than its factorization.

20012211312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20012211312 its reverse (21311221002), we get a palindrome (41323432314).

The spelling of 20012211312 in words is "twenty billion, twelve million, two hundred eleven thousand, three hundred twelve".