20115571272 has 64 divisors (see below), whose sum is σ = 50831055360. Its totient is φ = 6633024000.

The previous prime is 20115571261. The next prime is 20115571277. The reversal of 20115571272 is 27217551102.

It is not an unprimeable number, because it can be changed into a prime (20115571277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3470697 + ... + 3476487.

It is an arithmetic number, because the mean of its divisors is an integer number (794235240).

Almost surely, 2^20115571272 is an apocalyptic number.

It is an amenable number.

20115571272 is an abundant number, since it is smaller than the sum of its proper divisors (30715484088).

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

20115571272 is a wasteful number, since it uses less digits than its factorization.

20115571272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7334 (or 7330 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 33.

The spelling of 20115571272 in words is "twenty billion, one hundred fifteen million, five hundred seventy-one thousand, two hundred seventy-two".