20551314647 has 2 divisors, whose sum is σ = 20551314648. Its totient is φ = 20551314646.

The previous prime is 20551314557. The next prime is 20551314673. The reversal of 20551314647 is 74641315502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20551314647 - 2²⁶ = 20484205783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20551314647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20551314697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10275657323 + 10275657324.

It is an arithmetic number, because the mean of its divisors is an integer number (10275657324).

Almost surely, 2^20551314647 is an apocalyptic number.

20551314647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20551314647 is an equidigital number, since it uses as much as digits as its factorization.

20551314647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 20551314647 in words is "twenty billion, five hundred fifty-one million, three hundred fourteen thousand, six hundred forty-seven".