20015375128 has 16 divisors (see below), whose sum is σ = 42890089680. Its totient is φ = 8578017888.

The previous prime is 20015375117. The next prime is 20015375129. The reversal of 20015375128 is 82157351002.

It is a super-2 number, since 2×20015375128² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20015375093 and 20015375102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20015375129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178708651 + ... + 178708762.

It is an arithmetic number, because the mean of its divisors is an integer number (2680630605).

Almost surely, 2^20015375128 is an apocalyptic number.

20015375128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20015375128 is an abundant number, since it is smaller than the sum of its proper divisors (22874714552).

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

20015375128 is a wasteful number, since it uses less digits than its factorization.

20015375128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357417426 (or 357417422 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 20015375128 in words is "twenty billion, fifteen million, three hundred seventy-five thousand, one hundred twenty-eight".