20405053206 has 24 divisors (see below), whose sum is σ = 44214033240. Its totient is φ = 6801209856.

The previous prime is 20405053171. The next prime is 20405053217. The reversal of 20405053206 is 60235050402.

20405053206 is a `hidden beast` number, since 2 + 0 + 405 + 0 + 53 + 206 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20405053206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308310 + ... + 368598.

It is an arithmetic number, because the mean of its divisors is an integer number (1842251385).

Almost surely, 2^20405053206 is an apocalyptic number.

20405053206 is an abundant number, since it is smaller than the sum of its proper divisors (23808980034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20405053206 is a wasteful number, since it uses less digits than its factorization.

20405053206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79100 (or 79097 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 20405053206 in words is "twenty billion, four hundred five million, fifty-three thousand, two hundred six".