20721542052 has 24 divisors (see below), whose sum is σ = 48357796032. Its totient is φ = 6906104800.

The previous prime is 20721542033. The next prime is 20721542117. The reversal of 20721542052 is 25024512702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52224 + ... + 210167.

It is an arithmetic number, because the mean of its divisors is an integer number (2014908168).

Almost surely, 2^20721542052 is an apocalyptic number.

It is an amenable number.

20721542052 is an abundant number, since it is smaller than the sum of its proper divisors (27636253980).

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

20721542052 is a wasteful number, since it uses less digits than its factorization.

20721542052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268979 (or 268977 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 30.

The spelling of 20721542052 in words is "twenty billion, seven hundred twenty-one million, five hundred forty-two thousand, fifty-two".