20907756757 has 8 divisors (see below), whose sum is σ = 21243270176. Its totient is φ = 20572933392.

The previous prime is 20907756739. The next prime is 20907756761. The reversal of 20907756757 is 75765770902.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20907756757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20907756698 and 20907756707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20907756707) 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, 111258 + ... + 232795.

It is an arithmetic number, because the mean of its divisors is an integer number (2655408772).

Almost surely, 2^20907756757 is an apocalyptic number.

It is an amenable number.

20907756757 is a deficient number, since it is larger than the sum of its proper divisors (335513419).

20907756757 is an equidigital number, since it uses as much as digits as its factorization.

20907756757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345027.

The product of its (nonzero) digits is 6482700, while the sum is 55.

The spelling of 20907756757 in words is "twenty billion, nine hundred seven million, seven hundred fifty-six thousand, seven hundred fifty-seven".