20531441550061 has 16 divisors (see below), whose sum is σ = 22857748075008. Its totient is φ = 18313650388800.

The previous prime is 20531441550023. The next prime is 20531441550077. The reversal of 20531441550061 is 16005514413502.

It is not a de Polignac number, because 20531441550061 - 2⁷ = 20531441549933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20531441550061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531441550001) 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 15 ways as a sum of consecutive naturals, for example, 37353835 + ... + 37899496.

It is an arithmetic number, because the mean of its divisors is an integer number (1428609254688).

Almost surely, 2^{20531441550061} is an apocalyptic number.

It is an amenable number.

20531441550061 is a deficient number, since it is larger than the sum of its proper divisors (2326306524947).

20531441550061 is a wasteful number, since it uses less digits than its factorization.

20531441550061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75254052.

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 20531441550061 its reverse (16005514413502), we get a palindrome (36536955963563).

The spelling of 20531441550061 in words is "twenty trillion, five hundred thirty-one billion, four hundred forty-one million, five hundred fifty thousand, sixty-one".