20516505474 has 16 divisors (see below), whose sum is σ = 42447942720. Its totient is φ = 6603013200.

The previous prime is 20516505461. The next prime is 20516505491. The reversal of 20516505474 is 47450561502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58955302 + ... + 58955649.

It is an arithmetic number, because the mean of its divisors is an integer number (2652996420).

Almost surely, 2^20516505474 is an apocalyptic number.

20516505474 is an abundant number, since it is smaller than the sum of its proper divisors (21931437246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20516505474 is a wasteful number, since it uses less digits than its factorization.

20516505474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117910985.

The product of its (nonzero) digits is 168000, while the sum is 39.

The spelling of 20516505474 in words is "twenty billion, five hundred sixteen million, five hundred five thousand, four hundred seventy-four".