20205569940 has 48 divisors (see below), whose sum is σ = 56589684480. Its totient is φ = 5386810240.

The previous prime is 20205569849. The next prime is 20205569953. The reversal of 20205569940 is 4996550202.

It is a junction number, because it is equal to n+sod(n) for n = 20205569892 and 20205569901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213925 + ... + 293555.

It is an arithmetic number, because the mean of its divisors is an integer number (1178951760).

Almost surely, 2^20205569940 is an apocalyptic number.

20205569940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20205569940 is an abundant number, since it is smaller than the sum of its proper divisors (36384114540).

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

20205569940 is a wasteful number, since it uses less digits than its factorization.

20205569940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83872 (or 83870 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 20205569940 in words is "twenty billion, two hundred five million, five hundred sixty-nine thousand, nine hundred forty".