20883139849 has 16 divisors (see below), whose sum is σ = 24698721600. Its totient is φ = 17406682560.

The previous prime is 20883139829. The next prime is 20883139853. The reversal of 20883139849 is 94893138802.

It is a cyclic number.

It is not a de Polignac number, because 20883139849 - 2¹¹ = 20883137801 is a prime.

It is a super-2 number, since 2×20883139849² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20883139849.

It is not an unprimeable number, because it can be changed into a prime (20883139829) 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 15 ways as a sum of consecutive naturals, for example, 468747 + ... + 511360.

It is an arithmetic number, because the mean of its divisors is an integer number (1543670100).

Almost surely, 2^20883139849 is an apocalyptic number.

It is an amenable number.

20883139849 is a deficient number, since it is larger than the sum of its proper divisors (3815581751).

20883139849 is a wasteful number, since it uses less digits than its factorization.

20883139849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980280.

The product of its (nonzero) digits is 2985984, while the sum is 55.

The spelling of 20883139849 in words is "twenty billion, eight hundred eighty-three million, one hundred thirty-nine thousand, eight hundred forty-nine".