20311162728 has 64 divisors (see below), whose sum is σ = 52172218560. Its totient is φ = 6584633856.

The previous prime is 20311162727. The next prime is 20311162771. The reversal of 20311162728 is 82726111302.

It is not an unprimeable number, because it can be changed into a prime (20311162727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3813075 + ... + 3818397.

It is an arithmetic number, because the mean of its divisors is an integer number (815190915).

Almost surely, 2^20311162728 is an apocalyptic number.

It is an amenable number.

20311162728 is an abundant number, since it is smaller than the sum of its proper divisors (31861055832).

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

20311162728 is a wasteful number, since it uses less digits than its factorization.

20311162728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9666 (or 9662 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 20311162728 in words is "twenty billion, three hundred eleven million, one hundred sixty-two thousand, seven hundred twenty-eight".