20774898225 has 45 divisors (see below), whose sum is σ = 38494311163. Its totient is φ = 11076486480.

The previous prime is 20774898191. The next prime is 20774898251. The reversal of 20774898225 is 52289847702.

The square root of 20774898225 is 144135.

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., 7478963361 + 13295934864 = 86481^2 + 115308^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 20774898225 - 2¹⁵ = 20774865457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 6484474 + ... + 6487676.

Almost surely, 2^20774898225 is an apocalyptic number.

20774898225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20774898225 is the 144135-th square number.

20774898225 is the 72068-th centered octagonal number.

It is an amenable number.

20774898225 is a deficient number, since it is larger than the sum of its proper divisors (17719412938).

20774898225 is an frugal number, since it uses more digits than its factorization.

20774898225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6428 (or 3211 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 20774898225 in words is "twenty billion, seven hundred seventy-four million, eight hundred ninety-eight thousand, two hundred twenty-five".