20509732411 has 4 divisors (see below), whose sum is σ = 23439694192. Its totient is φ = 17579770632.

The previous prime is 20509732409. The next prime is 20509732429. The reversal of 20509732411 is 11423790502.

It is a happy number.

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 20509732411 - 2¹ = 20509732409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20509732471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1464980880 + ... + 1464980893.

It is an arithmetic number, because the mean of its divisors is an integer number (5859923548).

Almost surely, 2^20509732411 is an apocalyptic number.

20509732411 is a deficient number, since it is larger than the sum of its proper divisors (2929961781).

20509732411 is an equidigital number, since it uses as much as digits as its factorization.

20509732411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929961780.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 20509732411 in words is "twenty billion, five hundred nine million, seven hundred thirty-two thousand, four hundred eleven".