20649949344 has 72 divisors (see below), whose sum is σ = 59304795732. Its totient is φ = 6815155200.

The previous prime is 20649949261. The next prime is 20649949363. The reversal of 20649949344 is 44394994602.

It is a happy number.

20649949344 is a `hidden beast` number, since 2 + 0 + 64 + 99 + 493 + 4 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15422659344 + 5227290000 = 124188^2 + 72300^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325869 + ... + 384044.

Almost surely, 2^20649949344 is an apocalyptic number.

20649949344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20649949344 is an abundant number, since it is smaller than the sum of its proper divisors (38654846388).

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

20649949344 is a wasteful number, since it uses less digits than its factorization.

20649949344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710030 (or 710019 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 54.

The spelling of 20649949344 in words is "twenty billion, six hundred forty-nine million, nine hundred forty-nine thousand, three hundred forty-four".