20285165476 has 81 divisors (see below), whose sum is σ = 38907930817. Its totient is φ = 9251992960.

The previous prime is 20285165473. The next prime is 20285165489. The reversal of 20285165476 is 67456158202.

The square root of 20285165476 is 142426.

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

It can be written as a sum of positive squares in only one way, i.e., 15792948900 + 4492216576 = 125670^2 + 67024^2 .

It is a super-2 number, since 2×20285165476² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20285165471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 285706521 + ... + 285706591.

Almost surely, 2^20285165476 is an apocalyptic number.

20285165476 is the 142426-th square number.

It is an amenable number.

20285165476 is a deficient number, since it is larger than the sum of its proper divisors (18622765341).

20285165476 is an equidigital number, since it uses as much as digits as its factorization.

20285165476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 46.

It can be divided in two parts, 20285 and 165476, that added together give a square (185761 = 431²).

The spelling of 20285165476 in words is "twenty billion, two hundred eighty-five million, one hundred sixty-five thousand, four hundred seventy-six".