20162556449 has 24 divisors (see below), whose sum is σ = 23456900160. Its totient is φ = 16975689696.

The previous prime is 20162556431. The next prime is 20162556473. The reversal of 20162556449 is 94465526102.

It is not a de Polignac number, because 20162556449 - 2²⁴ = 20145779233 is a prime.

It is a super-2 number, since 2×20162556449² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20162556049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12079787 + ... + 12081455.

It is an arithmetic number, because the mean of its divisors is an integer number (977370840).

Almost surely, 2^20162556449 is an apocalyptic number.

It is an amenable number.

20162556449 is a deficient number, since it is larger than the sum of its proper divisors (3294343711).

20162556449 is a wasteful number, since it uses less digits than its factorization.

20162556449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037 (or 1910 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 20162556449 in words is "twenty billion, one hundred sixty-two million, five hundred fifty-six thousand, four hundred forty-nine".