20206475540 has 12 divisors (see below), whose sum is σ = 42433598676. Its totient is φ = 8082590208.

The previous prime is 20206475533. The next prime is 20206475563. The reversal of 20206475540 is 4557460202.

It can be written as a sum of positive squares in 2 ways, for example, as 14422568836 + 5783906704 = 120094^2 + 76052^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20206475540.

It is a congruent number.

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, 505161869 + ... + 505161908.

It is an arithmetic number, because the mean of its divisors is an integer number (3536133223).

Almost surely, 2^20206475540 is an apocalyptic number.

20206475540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20206475540 is an abundant number, since it is smaller than the sum of its proper divisors (22227123136).

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

20206475540 is a wasteful number, since it uses less digits than its factorization.

20206475540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010323786 (or 1010323784 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 35.

The spelling of 20206475540 in words is "twenty billion, two hundred six million, four hundred seventy-five thousand, five hundred forty".