20858717465 has 8 divisors (see below), whose sum is σ = 26347853760. Its totient is φ = 15808712112.

The previous prime is 20858717459. The next prime is 20858717489. The reversal of 20858717465 is 56471785802.

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 20858717465 - 2⁴ = 20858717449 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109782629 + ... + 109782818.

It is an arithmetic number, because the mean of its divisors is an integer number (3293481720).

Almost surely, 2^20858717465 is an apocalyptic number.

It is an amenable number.

20858717465 is a deficient number, since it is larger than the sum of its proper divisors (5489136295).

20858717465 is a wasteful number, since it uses less digits than its factorization.

20858717465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219565471.

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 20858717465 in words is "twenty billion, eight hundred fifty-eight million, seven hundred seventeen thousand, four hundred sixty-five".