20513665445463 has 32 divisors (see below), whose sum is σ = 30465475198400. Its totient is φ = 13642106531328.

The previous prime is 20513665445387. The next prime is 20513665445473. The reversal of 20513665445463 is 36454456631502.

20513665445463 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 36 + 6 + 544 + 5 + 4 + 63 = 666.

It is not a de Polignac number, because 20513665445463 - 2²⁶ = 20513598336599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513665445473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45094833 + ... + 45547461.

It is an arithmetic number, because the mean of its divisors is an integer number (952046099950).

Almost surely, 2^{20513665445463} is an apocalyptic number.

20513665445463 is a deficient number, since it is larger than the sum of its proper divisors (9951809752937).

20513665445463 is a wasteful number, since it uses less digits than its factorization.

20513665445463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456768 (or 456762 counting only the distinct ones).

The product of its (nonzero) digits is 31104000, while the sum is 54.

The spelling of 20513665445463 in words is "twenty trillion, five hundred thirteen billion, six hundred sixty-five million, four hundred forty-five thousand, four hundred sixty-three".