19945022020225 has 27 divisors (see below), whose sum is σ = 26272717975291. Its totient is φ = 15017142521600.

The previous prime is 19945022020223. The next prime is 19945022020241. The reversal of 19945022020225 is 52202022054991.

The square root of 19945022020225 is 4465985.

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

It can be written as a sum of positive squares in 13 ways, for example, as 87446178369 + 19857575841856 = 295713^2 + 4456184^2 .

It is not a de Polignac number, because 19945022020225 - 2¹ = 19945022020223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19945022020223) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 379582455 + ... + 379634995.

Almost surely, 2^{19945022020225} is an apocalyptic number.

19945022020225 is the 4465985-th square number.

19945022020225 is the 2232993-rd centered octagonal number.

It is an amenable number.

19945022020225 is a deficient number, since it is larger than the sum of its proper divisors (6327695955066).

19945022020225 is an frugal number, since it uses more digits than its factorization.

19945022020225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105126 (or 52563 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 19945022020225 in words is "nineteen trillion, nine hundred forty-five billion, twenty-two million, twenty thousand, two hundred twenty-five".