20994886835 has 16 divisors (see below), whose sum is σ = 28067437440. Its totient is φ = 14969297280.

The previous prime is 20994886823. The next prime is 20994886837. The reversal of 20994886835 is 53868849902.

It is not a de Polignac number, because 20994886835 - 2¹⁶ = 20994821299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20994886837) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5567051 + ... + 5570820.

It is an arithmetic number, because the mean of its divisors is an integer number (1754214840).

Almost surely, 2^20994886835 is an apocalyptic number.

20994886835 is a deficient number, since it is larger than the sum of its proper divisors (7072550605).

20994886835 is a wasteful number, since it uses less digits than its factorization.

20994886835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11137918.

The product of its (nonzero) digits is 29859840, while the sum is 62.

The spelling of 20994886835 in words is "twenty billion, nine hundred ninety-four million, eight hundred eighty-six thousand, eight hundred thirty-five".