20639121411 has 4 divisors (see below), whose sum is σ = 27518828552. Its totient is φ = 13759414272.

The previous prime is 20639121401. The next prime is 20639121413. The reversal of 20639121411 is 11412193602.

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

It is a de Polignac number, because none of the positive numbers 2^k-20639121411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20639121413) 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, 3439853566 + ... + 3439853571.

It is an arithmetic number, because the mean of its divisors is an integer number (6879707138).

Almost surely, 2^20639121411 is an apocalyptic number.

20639121411 is a deficient number, since it is larger than the sum of its proper divisors (6879707141).

20639121411 is an equidigital number, since it uses as much as digits as its factorization.

20639121411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6879707140.

The product of its (nonzero) digits is 2592, while the sum is 30.

The spelling of 20639121411 in words is "twenty billion, six hundred thirty-nine million, one hundred twenty-one thousand, four hundred eleven".