20718690550 has 24 divisors (see below), whose sum is σ = 38918326032. Its totient is φ = 8205420000.

The previous prime is 20718690547. The next prime is 20718690569. The reversal of 20718690550 is 5509681702.

It is a junction number, because it is equal to n+sod(n) for n = 20718690497 and 20718690506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2046306 + ... + 2056405.

It is an arithmetic number, because the mean of its divisors is an integer number (1621596918).

Almost surely, 2^20718690550 is an apocalyptic number.

20718690550 is a deficient number, since it is larger than the sum of its proper divisors (18199635482).

20718690550 is a wasteful number, since it uses less digits than its factorization.

20718690550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4102824 (or 4102819 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 20718690550 in words is "twenty billion, seven hundred eighteen million, six hundred ninety thousand, five hundred fifty".