20256515516 has 6 divisors (see below), whose sum is σ = 35448902160. Its totient is φ = 10128257756.

The previous prime is 20256515509. The next prime is 20256515519. The reversal of 20256515516 is 61551565202.

It is a self number, because there is not a number n which added to its sum of digits gives 20256515516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256515519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2532064436 + ... + 2532064443.

It is an arithmetic number, because the mean of its divisors is an integer number (5908150360).

Almost surely, 2^20256515516 is an apocalyptic number.

It is an amenable number.

20256515516 is a deficient number, since it is larger than the sum of its proper divisors (15192386644).

20256515516 is a wasteful number, since it uses less digits than its factorization.

20256515516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5064128883 (or 5064128881 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 20256515516 in words is "twenty billion, two hundred fifty-six million, five hundred fifteen thousand, five hundred sixteen".