20729664484 has 27 divisors (see below), whose sum is σ = 36563875803. Its totient is φ = 10283484672.

The previous prime is 20729664467. The next prime is 20729664491. The reversal of 20729664484 is 48446692702.

The square root of 20729664484 is 143978.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1051186084 + 19678478400 = 32422^2 + 140280^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 55575322 + ... + 55575694.

Almost surely, 2^20729664484 is an apocalyptic number.

20729664484 is the 143978-th square number.

It is an amenable number.

20729664484 is a deficient number, since it is larger than the sum of its proper divisors (15834211319).

20729664484 is an frugal number, since it uses more digits than its factorization.

20729664484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 52.

The spelling of 20729664484 in words is "twenty billion, seven hundred twenty-nine million, six hundred sixty-four thousand, four hundred eighty-four".