20517047756 has 6 divisors (see below), whose sum is σ = 35904833580. Its totient is φ = 10258523876.

The previous prime is 20517047753. The next prime is 20517047773. The reversal of 20517047756 is 65774071502.

It is not an unprimeable number, because it can be changed into a prime (20517047753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564630966 + ... + 2564630973.

It is an arithmetic number, because the mean of its divisors is an integer number (5984138930).

Almost surely, 2^20517047756 is an apocalyptic number.

It is an amenable number.

20517047756 is a deficient number, since it is larger than the sum of its proper divisors (15387785824).

20517047756 is a wasteful number, since it uses less digits than its factorization.

20517047756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129261943 (or 5129261941 counting only the distinct ones).

The product of its (nonzero) digits is 411600, while the sum is 44.

The spelling of 20517047756 in words is "twenty billion, five hundred seventeen million, forty-seven thousand, seven hundred fifty-six".