20788956217 has 8 divisors (see below), whose sum is σ = 20876446080. Its totient is φ = 20701579440.

The previous prime is 20788956193. The next prime is 20788956241. The reversal of 20788956217 is 71265988702.

It is an interprime number because it is at equal distance from previous prime (20788956193) and next prime (20788956241).

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 20788956217 - 2³¹ = 18641472569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20788956317) 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, 350784 + ... + 405742.

It is an arithmetic number, because the mean of its divisors is an integer number (2609555760).

Almost surely, 2^20788956217 is an apocalyptic number.

It is an amenable number.

20788956217 is a deficient number, since it is larger than the sum of its proper divisors (87489863).

20788956217 is a wasteful number, since it uses less digits than its factorization.

20788956217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56543.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 20788956217 in words is "twenty billion, seven hundred eighty-eight million, nine hundred fifty-six thousand, two hundred seventeen".