20863755947 has 8 divisors (see below), whose sum is σ = 21311401536. Its totient is φ = 20416266112.

The previous prime is 20863755943. The next prime is 20863756013. The reversal of 20863755947 is 74955736802.

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

It is a cyclic number.

It is not a de Polignac number, because 20863755947 - 2² = 20863755943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20863755892 and 20863755901.

It is not an unprimeable number, because it can be changed into a prime (20863755943) 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, 255443 + ... + 327075.

It is an arithmetic number, because the mean of its divisors is an integer number (2663925192).

Almost surely, 2^20863755947 is an apocalyptic number.

20863755947 is a deficient number, since it is larger than the sum of its proper divisors (447645589).

20863755947 is an equidigital number, since it uses as much as digits as its factorization.

20863755947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77877.

The product of its (nonzero) digits is 12700800, while the sum is 56.

The spelling of 20863755947 in words is "twenty billion, eight hundred sixty-three million, seven hundred fifty-five thousand, nine hundred forty-seven".