20602318957 has 4 divisors (see below), whose sum is σ = 22475257056. Its totient is φ = 18729380860.

The previous prime is 20602318909. The next prime is 20602318981. The reversal of 20602318957 is 75981320602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20602318957 - 2¹⁵ = 20602286189 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 (20602318757) 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, 936469033 + ... + 936469054.

It is an arithmetic number, because the mean of its divisors is an integer number (5618814264).

Almost surely, 2^20602318957 is an apocalyptic number.

It is an amenable number.

20602318957 is a deficient number, since it is larger than the sum of its proper divisors (1872938099).

20602318957 is a wasteful number, since it uses less digits than its factorization.

20602318957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872938098.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 20602318957 in words is "twenty billion, six hundred two million, three hundred eighteen thousand, nine hundred fifty-seven".