20915369479 has 4 divisors (see below), whose sum is σ = 21075028920. Its totient is φ = 20755710040.

The previous prime is 20915369459. The next prime is 20915369513. The reversal of 20915369479 is 97496351902.

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 20915369479 - 2⁷ = 20915369351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20915369429) 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, 79829524 + ... + 79829785.

It is an arithmetic number, because the mean of its divisors is an integer number (5268757230).

Almost surely, 2^20915369479 is an apocalyptic number.

20915369479 is a deficient number, since it is larger than the sum of its proper divisors (159659441).

20915369479 is a wasteful number, since it uses less digits than its factorization.

20915369479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159659440.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The spelling of 20915369479 in words is "twenty billion, nine hundred fifteen million, three hundred sixty-nine thousand, four hundred seventy-nine".