20956279438 has 8 divisors (see below), whose sum is σ = 31437238032. Its totient is φ = 10477200096.

The previous prime is 20956279411. The next prime is 20956279523. The reversal of 20956279438 is 83497265902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441595 + ... + 486742.

It is an arithmetic number, because the mean of its divisors is an integer number (3929654754).

Almost surely, 2^20956279438 is an apocalyptic number.

20956279438 is a deficient number, since it is larger than the sum of its proper divisors (10480958594).

20956279438 is a wasteful number, since it uses less digits than its factorization.

20956279438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939626.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 20956279438 in words is "twenty billion, nine hundred fifty-six million, two hundred seventy-nine thousand, four hundred thirty-eight".