20942445805 has 8 divisors (see below), whose sum is σ = 25155847800. Its totient is φ = 16737348096.

The previous prime is 20942445781. The next prime is 20942445817. The reversal of 20942445805 is 50854424902.

It can be written as a sum of positive squares in 4 ways, for example, as 20848356 + 20921597449 = 4566^2 + 144643^2 .

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 20942445805 - 2²³ = 20934057197 is a prime.

It is a congruent 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, 2070520 + ... + 2080609.

It is an arithmetic number, because the mean of its divisors is an integer number (3144480975).

Almost surely, 2^20942445805 is an apocalyptic number.

It is an amenable number.

20942445805 is a deficient number, since it is larger than the sum of its proper divisors (4213401995).

20942445805 is a wasteful number, since it uses less digits than its factorization.

20942445805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4152143.

The product of its (nonzero) digits is 460800, while the sum is 43.

The spelling of 20942445805 in words is "twenty billion, nine hundred forty-two million, four hundred forty-five thousand, eight hundred five".