20657260523061 has 6 divisors (see below), whose sum is σ = 29838265199990. Its totient is φ = 13771507015368.

The previous prime is 20657260523047. The next prime is 20657260523093. The reversal of 20657260523061 is 16032506275602.

20657260523061 is a `hidden beast` number, since 2 + 0 + 6 + 5 + 7 + 2 + 60 + 523 + 0 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17709494310225 + 2947766212836 = 4208265^2 + 1716906^2 .

It is not a de Polignac number, because 20657260523061 - 2¹¹ = 20657260521013 is a prime.

It is a super-2 number, since 2×20657260523061² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20657260522998 and 20657260523016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20657260523041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1147625584606 + ... + 1147625584623.

Almost surely, 2^{20657260523061} is an apocalyptic number.

It is an amenable number.

20657260523061 is a deficient number, since it is larger than the sum of its proper divisors (9181004676929).

20657260523061 is a wasteful number, since it uses less digits than its factorization.

20657260523061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295251169235 (or 2295251169232 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

Adding to 20657260523061 its reverse (16032506275602), we get a palindrome (36689766798663).

The spelling of 20657260523061 in words is "twenty trillion, six hundred fifty-seven billion, two hundred sixty million, five hundred twenty-three thousand, sixty-one".