20858006385 has 32 divisors (see below), whose sum is σ = 37269175680. Its totient is φ = 11067787584.

The previous prime is 20858006359. The next prime is 20858006419. The reversal of 20858006385 is 58360085802.

It is a happy number.

20858006385 is a `hidden beast` number, since 2 + 0 + 8 + 5 + 8 + 0 + 0 + 638 + 5 = 666.

It is not a de Polignac number, because 20858006385 - 2¹¹ = 20858004337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20858006385.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 365547 + ... + 418736.

It is an arithmetic number, because the mean of its divisors is an integer number (1164661740).

Almost surely, 2^20858006385 is an apocalyptic number.

It is an amenable number.

20858006385 is a deficient number, since it is larger than the sum of its proper divisors (16411169295).

20858006385 is a wasteful number, since it uses less digits than its factorization.

20858006385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784494 (or 784488 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 20858006385 in words is "twenty billion, eight hundred fifty-eight million, six thousand, three hundred eighty-five".