20449781412 has 12 divisors (see below), whose sum is σ = 47716156656. Its totient is φ = 6816593800.

The previous prime is 20449781393. The next prime is 20449781467. The reversal of 20449781412 is 21418794402.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852074214 + ... + 852074237.

It is an arithmetic number, because the mean of its divisors is an integer number (3976346388).

Almost surely, 2^20449781412 is an apocalyptic number.

It is an amenable number.

20449781412 is an abundant number, since it is smaller than the sum of its proper divisors (27266375244).

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

20449781412 is a wasteful number, since it uses less digits than its factorization.

20449781412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704148458 (or 1704148456 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The spelling of 20449781412 in words is "twenty billion, four hundred forty-nine million, seven hundred eighty-one thousand, four hundred twelve".