20421073858 has 8 divisors (see below), whose sum is σ = 31619727360. Its totient is φ = 9881164740.

The previous prime is 20421073843. The next prime is 20421073901. The reversal of 20421073858 is 85837012402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20421073858.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164686018 + ... + 164686141.

It is an arithmetic number, because the mean of its divisors is an integer number (3952465920).

Almost surely, 2^20421073858 is an apocalyptic number.

20421073858 is a deficient number, since it is larger than the sum of its proper divisors (11198653502).

20421073858 is a wasteful number, since it uses less digits than its factorization.

20421073858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329372192.

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 20421073858 in words is "twenty billion, four hundred twenty-one million, seventy-three thousand, eight hundred fifty-eight".