20864006449 has 32 divisors (see below), whose sum is σ = 26052897024. Its totient is φ = 16415201280.

The previous prime is 20864006437. The next prime is 20864006489. The reversal of 20864006449 is 94460046802.

It is a cyclic number.

It is not a de Polignac number, because 20864006449 - 2³³ = 12274071857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20864006489) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 623037 + ... + 655669.

It is an arithmetic number, because the mean of its divisors is an integer number (814153032).

Almost surely, 2^20864006449 is an apocalyptic number.

It is an amenable number.

20864006449 is a deficient number, since it is larger than the sum of its proper divisors (5188890575).

20864006449 is a wasteful number, since it uses less digits than its factorization.

20864006449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32937.

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 20864006449 in words is "twenty billion, eight hundred sixty-four million, six thousand, four hundred forty-nine".