20021161516 has 12 divisors (see below), whose sum is σ = 35039810232. Its totient is φ = 10009787168.

The previous prime is 20021161483. The next prime is 20021161597. The reversal of 20021161516 is 61516112002.

It is a happy 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, 139705 + ... + 244048.

It is an arithmetic number, because the mean of its divisors is an integer number (2919984186).

Almost surely, 2^20021161516 is an apocalyptic number.

It is an amenable number.

20021161516 is a deficient number, since it is larger than the sum of its proper divisors (15018648716).

20021161516 is a wasteful number, since it uses less digits than its factorization.

20021161516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396800 (or 396798 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 20021161516 its reverse (61516112002), we get a palindrome (81537273518).

The spelling of 20021161516 in words is "twenty billion, twenty-one million, one hundred sixty-one thousand, five hundred sixteen".