20512115443 has 8 divisors (see below), whose sum is σ = 20863584000. Its totient is φ = 20163131208.

The previous prime is 20512115441. The next prime is 20512115447. The reversal of 20512115443 is 34451121502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20512115443 - 2¹ = 20512115441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20512115441) 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, 604423 + ... + 637456.

It is an arithmetic number, because the mean of its divisors is an integer number (2607948000).

Almost surely, 2^20512115443 is an apocalyptic number.

20512115443 is a deficient number, since it is larger than the sum of its proper divisors (351468557).

20512115443 is a wasteful number, since it uses less digits than its factorization.

20512115443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242161.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 20512115443 its reverse (34451121502), we get a palindrome (54963236945).

The spelling of 20512115443 in words is "twenty billion, five hundred twelve million, one hundred fifteen thousand, four hundred forty-three".