20656215011 has 2 divisors, whose sum is σ = 20656215012. Its totient is φ = 20656215010.

The previous prime is 20656214989. The next prime is 20656215037. The reversal of 20656215011 is 11051265602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20656215011 - 2⁶ = 20656214947 is a prime.

It is not a weakly prime, because it can be changed into another prime (20656215311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328107505 + 10328107506.

It is an arithmetic number, because the mean of its divisors is an integer number (10328107506).

Almost surely, 2^20656215011 is an apocalyptic number.

20656215011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20656215011 is an equidigital number, since it uses as much as digits as its factorization.

20656215011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 20656215011 in words is "twenty billion, six hundred fifty-six million, two hundred fifteen thousand, eleven".