20985784203 has 8 divisors (see below), whose sum is σ = 28142786448. Its totient is φ = 13909652384.

The previous prime is 20985784133. The next prime is 20985784217. The reversal of 20985784203 is 30248758902.

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 20985784203 - 2¹³ = 20985776011 is a prime.

It is a super-2 number, since 2×20985784203² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20981784203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20217000 + ... + 20218037.

It is an arithmetic number, because the mean of its divisors is an integer number (3517848306).

Almost surely, 2^20985784203 is an apocalyptic number.

20985784203 is a deficient number, since it is larger than the sum of its proper divisors (7157002245).

20985784203 is a wasteful number, since it uses less digits than its factorization.

20985784203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40435213.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 20985784203 in words is "twenty billion, nine hundred eighty-five million, seven hundred eighty-four thousand, two hundred three".