20907316178949 has 8 divisors (see below), whose sum is σ = 27878213293120. Its totient is φ = 13937314925376.

The previous prime is 20907316178923. The next prime is 20907316178951. The reversal of 20907316178949 is 94987161370902.

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

It is not a de Polignac number, because 20907316178949 - 2³⁹ = 20357560365061 is a prime.

It is a super-2 number, since 2×20907316178949² (a number of 27 digits) contains 22 as substring.

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 20907316178949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20907316178149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223910692 + ... + 224004045.

It is an arithmetic number, because the mean of its divisors is an integer number (3484776661640).

Almost surely, 2^{20907316178949} is an apocalyptic number.

It is an amenable number.

20907316178949 is a deficient number, since it is larger than the sum of its proper divisors (6970897114171).

20907316178949 is a wasteful number, since it uses less digits than its factorization.

20907316178949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447930299.

The product of its (nonzero) digits is 41150592, while the sum is 66.

The spelling of 20907316178949 in words is "twenty trillion, nine hundred seven billion, three hundred sixteen million, one hundred seventy-eight thousand, nine hundred forty-nine".