20401000649 has 16 divisors (see below), whose sum is σ = 21437805120. Its totient is φ = 19386924480.

The previous prime is 20401000643. The next prime is 20401000657. The reversal of 20401000649 is 94600010402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20401000649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20401000643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2679482 + ... + 2687084.

It is an arithmetic number, because the mean of its divisors is an integer number (1339862820).

Almost surely, 2^20401000649 is an apocalyptic number.

20401000649 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20401000649 is a deficient number, since it is larger than the sum of its proper divisors (1036804471).

20401000649 is a wasteful number, since it uses less digits than its factorization.

20401000649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9080.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 20401000649 in words is "twenty billion, four hundred one million, six hundred forty-nine", and thus it is an aban number.