20996515189 has 32 divisors (see below), whose sum is σ = 23203000800. Its totient is φ = 18882969600.

The previous prime is 20996515181. The next prime is 20996515213. The reversal of 20996515189 is 98151569902.

It can be written as a sum of positive squares in 16 ways, for example, as 2319192964 + 18677322225 = 48158^2 + 136665^2 .

It is a cyclic number.

It is not a de Polignac number, because 20996515189 - 2³ = 20996515181 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 (20996515181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41250267 + ... + 41250775.

It is an arithmetic number, because the mean of its divisors is an integer number (725093775).

Almost surely, 2^20996515189 is an apocalyptic number.

It is an amenable number.

20996515189 is a deficient number, since it is larger than the sum of its proper divisors (2206485611).

20996515189 is a wasteful number, since it uses less digits than its factorization.

20996515189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065.

The product of its (nonzero) digits is 1749600, while the sum is 55.

The spelling of 20996515189 in words is "twenty billion, nine hundred ninety-six million, five hundred fifteen thousand, one hundred eighty-nine".