20761257117 has 32 divisors (see below), whose sum is σ = 29536153600. Its totient is φ = 12933805248.

The previous prime is 20761257059. The next prime is 20761257131. The reversal of 20761257117 is 71175216702.

It is a happy number.

It is not a de Polignac number, because 20761257117 - 2⁶ = 20761257053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20761257317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7189848 + ... + 7192734.

It is an arithmetic number, because the mean of its divisors is an integer number (923004800).

Almost surely, 2^20761257117 is an apocalyptic number.

It is an amenable number.

20761257117 is a deficient number, since it is larger than the sum of its proper divisors (8774896483).

20761257117 is a wasteful number, since it uses less digits than its factorization.

20761257117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4585.

The product of its (nonzero) digits is 41160, while the sum is 39.

The spelling of 20761257117 in words is "twenty billion, seven hundred sixty-one million, two hundred fifty-seven thousand, one hundred seventeen".