20112212340 has 144 divisors (see below), whose sum is σ = 67142851776. Its totient is φ = 4832486400.

The previous prime is 20112212311. The next prime is 20112212357. The reversal of 20112212340 is 4321221102.

It is a happy number.

20112212340 is a `hidden beast` number, since 2 + 0 + 112 + 212 + 340 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 178795 + ... + 268685.

It is an arithmetic number, because the mean of its divisors is an integer number (466269804).

Almost surely, 2^20112212340 is an apocalyptic number.

20112212340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20112212340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33571425888).

20112212340 is an abundant number, since it is smaller than the sum of its proper divisors (47030639436).

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

20112212340 is a wasteful number, since it uses less digits than its factorization.

20112212340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90030 (or 90025 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20112212340 its reverse (4321221102), we get a palindrome (24433433442).

It can be divided in two parts, 2011221 and 2340, that added together give a square (2013561 = 1419²).

The spelling of 20112212340 in words is "twenty billion, one hundred twelve million, two hundred twelve thousand, three hundred forty".