20840215858 has 32 divisors (see below), whose sum is σ = 38989687680. Its totient is φ = 8116277760.

The previous prime is 20840215829. The next prime is 20840215861. The reversal of 20840215858 is 85851204802.

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 15 ways as a sum of consecutive naturals, for example, 373228 + ... + 425416.

It is an arithmetic number, because the mean of its divisors is an integer number (1218427740).

Almost surely, 2^20840215858 is an apocalyptic number.

20840215858 is a deficient number, since it is larger than the sum of its proper divisors (18149471822).

20840215858 is a wasteful number, since it uses less digits than its factorization.

20840215858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54802.

The product of its (nonzero) digits is 204800, while the sum is 43.

The spelling of 20840215858 in words is "twenty billion, eight hundred forty million, two hundred fifteen thousand, eight hundred fifty-eight".