20156675728 has 40 divisors (see below), whose sum is σ = 44654016960. Its totient is φ = 8634437760.

The previous prime is 20156675723. The next prime is 20156675741. The reversal of 20156675728 is 82757665102.

It is a happy number.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20156675723) 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 7 ways as a sum of consecutive naturals, for example, 197763 + ... + 281821.

It is an arithmetic number, because the mean of its divisors is an integer number (1116350424).

Almost surely, 2^20156675728 is an apocalyptic number.

20156675728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20156675728 is an abundant number, since it is smaller than the sum of its proper divisors (24497341232).

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

20156675728 is a wasteful number, since it uses less digits than its factorization.

20156675728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86215 (or 86209 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 20156675728 in words is "twenty billion, one hundred fifty-six million, six hundred seventy-five thousand, seven hundred twenty-eight".