20572991011 has 4 divisors (see below), whose sum is σ = 21010714272. Its totient is φ = 20135267752.

The previous prime is 20572991009. The next prime is 20572991041. The reversal of 20572991011 is 11019927502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20572991011 - 2¹ = 20572991009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20572991041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218861560 + ... + 218861653.

It is an arithmetic number, because the mean of its divisors is an integer number (5252678568).

Almost surely, 2^20572991011 is an apocalyptic number.

20572991011 is a deficient number, since it is larger than the sum of its proper divisors (437723261).

20572991011 is an equidigital number, since it uses as much as digits as its factorization.

20572991011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437723260.

The product of its (nonzero) digits is 11340, while the sum is 37.

The spelling of 20572991011 in words is "twenty billion, five hundred seventy-two million, nine hundred ninety-one thousand, eleven".