20016362821225 has 9 divisors (see below), whose sum is σ = 24820317636933. Its totient is φ = 16013072361120.

The previous prime is 20016362821201. The next prime is 20016362821249. The reversal of 20016362821225 is 52212826361002.

It is a happy number.

The square root of 20016362821225 is 4473965.

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

It is an interprime number because it is at equal distance from previous prime (20016362821201) and next prime (20016362821249).

It can be written as a sum of positive squares in 4 ways, for example, as 16541303769 + 19999821517456 = 128613^2 + 4472116^2 .

It is not a de Polignac number, because 20016362821225 - 2⁴¹ = 17817339565673 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 (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21922429 + ... + 22817221.

Almost surely, 2^{20016362821225} is an apocalyptic number.

20016362821225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20016362821225 is the 4473965-th square number.

20016362821225 is the 2236983-rd centered octagonal number.

It is an amenable number.

20016362821225 is a deficient number, since it is larger than the sum of its proper divisors (4803954815708).

20016362821225 is an frugal number, since it uses more digits than its factorization.

20016362821225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789596 (or 894798 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 20016362821225 in words is "twenty trillion, sixteen billion, three hundred sixty-two million, eight hundred twenty-one thousand, two hundred twenty-five".