20608683551 has 4 divisors (see below), whose sum is σ = 21820959072. Its totient is φ = 19396408032.

The previous prime is 20608683527. The next prime is 20608683581. The reversal of 20608683551 is 15538680602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20608683551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20608683521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606137735 + ... + 606137768.

It is an arithmetic number, because the mean of its divisors is an integer number (5455239768).

Almost surely, 2^20608683551 is an apocalyptic number.

20608683551 is a deficient number, since it is larger than the sum of its proper divisors (1212275521).

20608683551 is a wasteful number, since it uses less digits than its factorization.

20608683551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212275520.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 20608683551 in words is "twenty billion, six hundred eight million, six hundred eighty-three thousand, five hundred fifty-one".