20531135534 has 64 divisors (see below), whose sum is σ = 38784614400. Its totient is φ = 8099652960.

The previous prime is 20531135519. The next prime is 20531135551. The reversal of 20531135534 is 43553113502.

It is a self number, because there is not a number n which added to its sum of digits gives 20531135534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3412589 + ... + 3418599.

It is an arithmetic number, because the mean of its divisors is an integer number (606009600).

Almost surely, 2^20531135534 is an apocalyptic number.

20531135534 is a deficient number, since it is larger than the sum of its proper divisors (18253478866).

20531135534 is a wasteful number, since it uses less digits than its factorization.

20531135534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6430 (or 6416 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 32.

The spelling of 20531135534 in words is "twenty billion, five hundred thirty-one million, one hundred thirty-five thousand, five hundred thirty-four".