20513515474 has 16 divisors (see below), whose sum is σ = 30963554496. Its totient is φ = 10192366800.

The previous prime is 20513515447. The next prime is 20513515481. The reversal of 20513515474 is 47451531502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1536769 + ... + 1550059.

It is an arithmetic number, because the mean of its divisors is an integer number (1935222156).

Almost surely, 2^20513515474 is an apocalyptic number.

20513515474 is a deficient number, since it is larger than the sum of its proper divisors (10450039022).

20513515474 is a wasteful number, since it uses less digits than its factorization.

20513515474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18081.

The product of its (nonzero) digits is 84000, while the sum is 37.

The spelling of 20513515474 in words is "twenty billion, five hundred thirteen million, five hundred fifteen thousand, four hundred seventy-four".