20021020616 has 16 divisors (see below), whose sum is σ = 38455009740. Its totient is φ = 9766351360.

The previous prime is 20021020603. The next prime is 20021020619. The reversal of 20021020616 is 61602012002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19968516100 + 52504516 = 141310^2 + 7246^2 .

It is not an unprimeable number, because it can be changed into a prime (20021020619) 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, 30519521 + ... + 30520176.

Almost surely, 2^20021020616 is an apocalyptic number.

It is an amenable number.

20021020616 is a deficient number, since it is larger than the sum of its proper divisors (18433989124).

20021020616 is a wasteful number, since it uses less digits than its factorization.

20021020616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61039744 (or 61039740 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20021020616 its reverse (61602012002), we get a palindrome (81623032618).

The spelling of 20021020616 in words is "twenty billion, twenty-one million, twenty thousand, six hundred sixteen".