20531245123134 has 320 divisors, whose sum is σ = 50195823068160. Its totient is φ = 6250761861120.

The previous prime is 20531245123111. The next prime is 20531245123177. The reversal of 20531245123134 is 43132154213502.

20531245123134 is a `hidden beast` number, since 2 + 0 + 5 + 3 + 1 + 2 + 4 + 512 + 3 + 134 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 5233555297 + ... + 5233559219.

It is an arithmetic number, because the mean of its divisors is an integer number (156861947088).

Almost surely, 2^{20531245123134} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20531245123134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25097911534080).

20531245123134 is an abundant number, since it is smaller than the sum of its proper divisors (29664577945026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20531245123134 is a wasteful number, since it uses less digits than its factorization.

20531245123134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4477 (or 4468 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 20531245123134 its reverse (43132154213502), we get a palindrome (63663399336636).

The spelling of 20531245123134 in words is "twenty trillion, five hundred thirty-one billion, two hundred forty-five million, one hundred twenty-three thousand, one hundred thirty-four".