20112215140 has 24 divisors (see below), whose sum is σ = 43692054840. Its totient is φ = 7767475968.

The previous prime is 20112215129. The next prime is 20112215147. The reversal of 20112215140 is 4151221102.

It can be written as a sum of positive squares in 4 ways, for example, as 6095549476 + 14016665664 = 78074^2 + 118392^2 .

It is not an unprimeable number, because it can be changed into a prime (20112215147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17337537 + ... + 17338696.

It is an arithmetic number, because the mean of its divisors is an integer number (1820502285).

Almost surely, 2^20112215140 is an apocalyptic number.

20112215140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20112215140 is an abundant number, since it is smaller than the sum of its proper divisors (23579839700).

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

20112215140 is a wasteful number, since it uses less digits than its factorization.

20112215140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34676271 (or 34676269 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 20112215140 its reverse (4151221102), we get a palindrome (24263436242).

The spelling of 20112215140 in words is "twenty billion, one hundred twelve million, two hundred fifteen thousand, one hundred forty".