20705771025 has 81 divisors (see below), whose sum is σ = 38009271027. Its totient is φ = 10774857600.

The previous prime is 20705771017. The next prime is 20705771039. The reversal of 20705771025 is 52017750702.

The square root of 20705771025 is 143895.

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

20705771025 is a `hidden beast` number, since 2 + 0 + 70 + 577 + 10 + 2 + 5 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 19951280001 + 754491024 = 141249^2 + 27468^2 .

It is not a de Polignac number, because 20705771025 - 2³ = 20705771017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 114396435 + ... + 114396615.

Almost surely, 2^20705771025 is an apocalyptic number.

20705771025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20705771025 is the 143895-th square number.

20705771025 is the 71948-th centered octagonal number.

It is an amenable number.

20705771025 is a deficient number, since it is larger than the sum of its proper divisors (17303500002).

20705771025 is an equidigital number, since it uses as much as digits as its factorization.

20705771025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 34300, while the sum is 36.

Multiplying 20705771025 by its sum of digits (36), we get a square (745407756900 = 863370²).

The spelling of 20705771025 in words is "twenty billion, seven hundred five million, seven hundred seventy-one thousand, twenty-five".