20553523225 has 27 divisors (see below), whose sum is σ = 26024420919. Its totient is φ = 16102756800.

The previous prime is 20553523213. The next prime is 20553523231. The reversal of 20553523225 is 52232535502.

The square root of 20553523225 is 143365.

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 10616623369 + 9936899856 = 103037^2 + 99684^2 .

It is not a de Polignac number, because 20553523225 - 2¹³ = 20553515033 is a prime.

It is a super-2 number, since 2×20553523225² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 37991455 + ... + 37991995.

Almost surely, 2^20553523225 is an apocalyptic number.

20553523225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20553523225 is the 143365-th square number.

20553523225 is the 71683-rd centered octagonal number.

It is an amenable number.

20553523225 is a deficient number, since it is larger than the sum of its proper divisors (5470897694).

20553523225 is an frugal number, since it uses more digits than its factorization.

20553523225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 34.

The spelling of 20553523225 in words is "twenty billion, five hundred fifty-three million, five hundred twenty-three thousand, two hundred twenty-five".