20765790457 has 8 divisors (see below), whose sum is σ = 21089597792. Its totient is φ = 20442391200.

The previous prime is 20765790439. The next prime is 20765790467. The reversal of 20765790457 is 75409756702.

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 20765790457 - 2¹¹ = 20765788409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20765790407) 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, 1357 + ... + 203797.

It is an arithmetic number, because the mean of its divisors is an integer number (2636199724).

Almost surely, 2^20765790457 is an apocalyptic number.

It is an amenable number.

20765790457 is a deficient number, since it is larger than the sum of its proper divisors (323807335).

20765790457 is a wasteful number, since it uses less digits than its factorization.

20765790457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204039.

The product of its (nonzero) digits is 3704400, while the sum is 52.

The spelling of 20765790457 in words is "twenty billion, seven hundred sixty-five million, seven hundred ninety thousand, four hundred fifty-seven".