20021808061 has 8 divisors (see below), whose sum is σ = 20363824800. Its totient is φ = 19679880240.

The previous prime is 20021808043. The next prime is 20021808067. The reversal of 20021808061 is 16080812002.

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 20021808061 - 2⁵ = 20021808029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021808067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561555 + ... + 596143.

It is an arithmetic number, because the mean of its divisors is an integer number (2545478100).

Almost surely, 2^20021808061 is an apocalyptic number.

It is an amenable number.

20021808061 is a deficient number, since it is larger than the sum of its proper divisors (342016739).

20021808061 is an equidigital number, since it uses as much as digits as its factorization.

20021808061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44459.

The product of its (nonzero) digits is 1536, while the sum is 28.

The spelling of 20021808061 in words is "twenty billion, twenty-one million, eight hundred eight thousand, sixty-one".