20212674561 has 6 divisors (see below), whose sum is σ = 29196085490. Its totient is φ = 13475116368.

The previous prime is 20212674539. The next prime is 20212674593. The reversal of 20212674561 is 16547621202.

It is a happy number.

20212674561 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 26 + 74 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17720668161 + 2492006400 = 133119^2 + 49920^2 .

It is not a de Polignac number, because 20212674561 - 2⁶ = 20212674497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20212674661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1122926356 + ... + 1122926373.

Almost surely, 2^20212674561 is an apocalyptic number.

It is an amenable number.

20212674561 is a deficient number, since it is larger than the sum of its proper divisors (8983410929).

20212674561 is a wasteful number, since it uses less digits than its factorization.

20212674561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245852735 (or 2245852732 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 20212674561 in words is "twenty billion, two hundred twelve million, six hundred seventy-four thousand, five hundred sixty-one".