20858730457 has 8 divisors (see below), whose sum is σ = 20891707200. Its totient is φ = 20825782320.

The previous prime is 20858730439. The next prime is 20858730479. The reversal of 20858730457 is 75403785802.

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-20858730457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20858730457.

It is not an unprimeable number, because it can be changed into a prime (20858730757) 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, 1789107 + ... + 1800727.

It is an arithmetic number, because the mean of its divisors is an integer number (2611463400).

Almost surely, 2^20858730457 is an apocalyptic number.

It is an amenable number.

20858730457 is a deficient number, since it is larger than the sum of its proper divisors (32976743).

20858730457 is a wasteful number, since it uses less digits than its factorization.

20858730457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14303.

The product of its (nonzero) digits is 1881600, while the sum is 49.

The spelling of 20858730457 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty thousand, four hundred fifty-seven".