20858465456 has 90 divisors (see below), whose sum is σ = 42338376108. Its totient is φ = 9954672000.

The previous prime is 20858465447. The next prime is 20858465461. The reversal of 20858465456 is 65456485802.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a junction number, because it is equal to n+sod(n) for n = 20858465398 and 20858465407.

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 17 ways as a sum of consecutive naturals, for example, 83101331 + ... + 83101581.

Almost surely, 2^20858465456 is an apocalyptic number.

It is an amenable number.

20858465456 is an abundant number, since it is smaller than the sum of its proper divisors (21479910652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20858465456 is an equidigital number, since it uses as much as digits as its factorization.

20858465456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 9216000, while the sum is 53.

The spelling of 20858465456 in words is "twenty billion, eight hundred fifty-eight million, four hundred sixty-five thousand, four hundred fifty-six".