20623643211 has 16 divisors (see below), whose sum is σ = 29119647744. Its totient is φ = 12938584704.

The previous prime is 20623643153. The next prime is 20623643321. The reversal of 20623643211 is 11234632602.

It is not a de Polignac number, because 20623643211 - 2²⁶ = 20556534347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20623643111) 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, 430486 + ... + 475988.

It is an arithmetic number, because the mean of its divisors is an integer number (1819977984).

Almost surely, 2^20623643211 is an apocalyptic number.

20623643211 is a deficient number, since it is larger than the sum of its proper divisors (8496004533).

20623643211 is a wasteful number, since it uses less digits than its factorization.

20623643211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54410.

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 20623643211 in words is "twenty billion, six hundred twenty-three million, six hundred forty-three thousand, two hundred eleven".