20843854834 has 128 divisors (see below), whose sum is σ = 37809192960. Its totient is φ = 8519385600.

The previous prime is 20843854817. The next prime is 20843854847. The reversal of 20843854834 is 43845834802.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 124813419 + ... + 124813585.

It is an arithmetic number, because the mean of its divisors is an integer number (295384320).

Almost surely, 2^20843854834 is an apocalyptic number.

20843854834 is a deficient number, since it is larger than the sum of its proper divisors (16965338126).

20843854834 is a wasteful number, since it uses less digits than its factorization.

20843854834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416.

The product of its (nonzero) digits is 2949120, while the sum is 49.

The spelling of 20843854834 in words is "twenty billion, eight hundred forty-three million, eight hundred fifty-four thousand, eight hundred thirty-four".