20640142911 has 16 divisors (see below), whose sum is σ = 27842181120. Its totient is φ = 13599627360.

The previous prime is 20640142883. The next prime is 20640142931. The reversal of 20640142911 is 11924104602.

It is not a de Polignac number, because 20640142911 - 2⁶ = 20640142847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20640142931) 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, 91666 + ... + 222896.

It is an arithmetic number, because the mean of its divisors is an integer number (1740136320).

Almost surely, 2^20640142911 is an apocalyptic number.

20640142911 is a deficient number, since it is larger than the sum of its proper divisors (7202038209).

20640142911 is a wasteful number, since it uses less digits than its factorization.

20640142911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131846.

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 20640142911 in words is "twenty billion, six hundred forty million, one hundred forty-two thousand, nine hundred eleven".