20697014879 has 4 divisors (see below), whose sum is σ = 20788191384. Its totient is φ = 20605838376.

The previous prime is 20697014873. The next prime is 20697014903. The reversal of 20697014879 is 97841079602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20697014879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20697014879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20697014873) 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, 45587912 + ... + 45588365.

It is an arithmetic number, because the mean of its divisors is an integer number (5197047846).

Almost surely, 2^20697014879 is an apocalyptic number.

20697014879 is a deficient number, since it is larger than the sum of its proper divisors (91176505).

20697014879 is an equidigital number, since it uses as much as digits as its factorization.

20697014879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91176504.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 20697014879 in words is "twenty billion, six hundred ninety-seven million, fourteen thousand, eight hundred seventy-nine".