20344743225 has 81 divisors (see below), whose sum is σ = 37597461447. Its totient is φ = 10516193280.

The previous prime is 20344743169. The next prime is 20344743227. The reversal of 20344743225 is 52234744302.

The square root of 20344743225 is 142635.

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

20344743225 is a `hidden beast` number, since 20 + 344 + 74 + 3 + 225 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 713370681 + 19631372544 = 26709^2 + 140112^2 .

It is not a de Polignac number, because 20344743225 - 2³³ = 11754808633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20344743225.

It is not an unprimeable number, because it can be changed into a prime (20344743227) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 79162297 + ... + 79162553.

Almost surely, 2^20344743225 is an apocalyptic number.

20344743225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20344743225 is the 142635-th square number.

20344743225 is the 71318-th centered octagonal number.

It is an amenable number.

20344743225 is a deficient number, since it is larger than the sum of its proper divisors (17252718222).

20344743225 is an equidigital number, since it uses as much as digits as its factorization.

20344743225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 36.

Multiplying 20344743225 by its sum of digits (36), we get a square (732410756100 = 855810²).

The spelling of 20344743225 in words is "twenty billion, three hundred forty-four million, seven hundred forty-three thousand, two hundred twenty-five".