20291311272 has 128 divisors (see below), whose sum is σ = 52131139200. Its totient is φ = 6580224000.

The previous prime is 20291311259. The next prime is 20291311291. The reversal of 20291311272 is 27211319202.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49611804 + ... + 49612212.

It is an arithmetic number, because the mean of its divisors is an integer number (407274525).

Almost surely, 2^20291311272 is an apocalyptic number.

It is an amenable number.

20291311272 is an abundant number, since it is smaller than the sum of its proper divisors (31839827928).

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

20291311272 is a wasteful number, since it uses less digits than its factorization.

20291311272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

It can be divided in two parts, 202913 and 11272, that added together give a triangular number (214185 = T₆₅₄).

The spelling of 20291311272 in words is "twenty billion, two hundred ninety-one million, three hundred eleven thousand, two hundred seventy-two".