20356744655 has 8 divisors (see below), whose sum is σ = 26307177792. Its totient is φ = 15032672928.

The previous prime is 20356744637. The next prime is 20356744657. The reversal of 20356744655 is 55644765302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20356744655 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 (20356744657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156590279 + ... + 156590408.

It is an arithmetic number, because the mean of its divisors is an integer number (3288397224).

Almost surely, 2^20356744655 is an apocalyptic number.

20356744655 is a deficient number, since it is larger than the sum of its proper divisors (5950433137).

20356744655 is a wasteful number, since it uses less digits than its factorization.

20356744655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313180705.

The product of its (nonzero) digits is 3024000, while the sum is 47.

The spelling of 20356744655 in words is "twenty billion, three hundred fifty-six million, seven hundred forty-four thousand, six hundred fifty-five".