20512519515 has 32 divisors (see below), whose sum is σ = 38611805760. Its totient is φ = 10296479232.

The previous prime is 20512519493. The next prime is 20512519541. The reversal of 20512519515 is 51591521502.

It is a happy number.

20512519515 is a `hidden beast` number, since 2 + 0 + 5 + 125 + 19 + 515 = 666.

It is not a de Polignac number, because 20512519515 - 2⁶ = 20512519451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20512519515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4466664 + ... + 4471253.

It is an arithmetic number, because the mean of its divisors is an integer number (1206618930).

Almost surely, 2^20512519515 is an apocalyptic number.

20512519515 is a deficient number, since it is larger than the sum of its proper divisors (18099286245).

20512519515 is a wasteful number, since it uses less digits than its factorization.

20512519515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8937948 (or 8937942 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 20512519515 in words is "twenty billion, five hundred twelve million, five hundred nineteen thousand, five hundred fifteen".