20021854705 has 8 divisors (see below), whose sum is σ = 24029232192. Its totient is φ = 16015479408.

The previous prime is 20021854693. The next prime is 20021854739. The reversal of 20021854705 is 50745812002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20021854705 - 2²¹ = 20019757553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205869 + ... + 287098.

It is an arithmetic number, because the mean of its divisors is an integer number (3003654024).

Almost surely, 2^20021854705 is an apocalyptic number.

It is an amenable number.

20021854705 is a deficient number, since it is larger than the sum of its proper divisors (4007377487).

20021854705 is an equidigital number, since it uses as much as digits as its factorization.

20021854705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501095.

The product of its (nonzero) digits is 22400, while the sum is 34.

The spelling of 20021854705 in words is "twenty billion, twenty-one million, eight hundred fifty-four thousand, seven hundred five".