20732256169 has 9 divisors (see below), whose sum is σ = 20904581271. Its totient is φ = 20561343600.

The previous prime is 20732256161. The next prime is 20732256173. The reversal of 20732256169 is 96165223702.

The square root of 20732256169 is 143987.

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

It can be written as a sum of positive squares in only one way, i.e., 12178226025 + 8554030144 = 110355^2 + 92488^2 .

It is not a de Polignac number, because 20732256169 - 2³ = 20732256161 is a prime.

It is a super-2 number, since 2×20732256169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20732256161) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19725694 + ... + 19726744.

Almost surely, 2^20732256169 is an apocalyptic number.

20732256169 is the 143987-th square number.

20732256169 is the 71994-th centered octagonal number.

It is an amenable number.

20732256169 is a deficient number, since it is larger than the sum of its proper divisors (172325102).

20732256169 is an frugal number, since it uses more digits than its factorization.

20732256169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376 (or 1188 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 20732256169 in words is "twenty billion, seven hundred thirty-two million, two hundred fifty-six thousand, one hundred sixty-nine".