20513255545431 has 24 divisors (see below), whose sum is σ = 32324147176464. Its totient is φ = 12432187877760.

The previous prime is 20513255545429. The next prime is 20513255545441. The reversal of 20513255545431 is 13454555231502.

20513255545431 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 3 + 2 + 55 + 54 + 543 + 1 = 666.

It is not a de Polignac number, because 20513255545431 - 2¹ = 20513255545429 is a prime.

It is a super-2 number, since 2×20513255545431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513255545441) 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 23 ways as a sum of consecutive naturals, for example, 14975665 + ... + 16287941.

It is an arithmetic number, because the mean of its divisors is an integer number (1346839465686).

Almost surely, 2^{20513255545431} is an apocalyptic number.

20513255545431 is a deficient number, since it is larger than the sum of its proper divisors (11810891631033).

20513255545431 is a wasteful number, since it uses less digits than its factorization.

20513255545431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470191 (or 1470188 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 45.

The spelling of 20513255545431 in words is "twenty trillion, five hundred thirteen billion, two hundred fifty-five million, five hundred forty-five thousand, four hundred thirty-one".