20506517146 has 16 divisors (see below), whose sum is σ = 32171315904. Its totient is φ = 9784805184.

The previous prime is 20506517131. The next prime is 20506517167. The reversal of 20506517146 is 64171560502.

It is a happy number.

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, 494856 + ... + 534691.

It is an arithmetic number, because the mean of its divisors is an integer number (2010707244).

Almost surely, 2^20506517146 is an apocalyptic number.

20506517146 is a deficient number, since it is larger than the sum of its proper divisors (11664798758).

20506517146 is a wasteful number, since it uses less digits than its factorization.

20506517146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030005.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 20506517146 in words is "twenty billion, five hundred six million, five hundred seventeen thousand, one hundred forty-six".