978202220020 has 48 divisors (see below), whose sum is σ = 2199500367120. Its totient is φ = 364126552064.

The previous prime is 978202219999. The next prime is 978202220027. The reversal of 978202220020 is 20022202879.

It can be written as a sum of positive squares in 8 ways, for example, as 8579946384 + 969622273636 = 92628^2 + 984694^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978202220027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16133029 + ... + 16193548.

It is an arithmetic number, because the mean of its divisors is an integer number (45822924315).

Almost surely, 2^978202220020 is an apocalyptic number.

It is an amenable number.

978202220020 is an abundant number, since it is smaller than the sum of its proper divisors (1221298147100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

978202220020 is a wasteful number, since it uses less digits than its factorization.

978202220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32326692 (or 32326690 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

Adding to 978202220020 its reverse (20022202879), we get a palindrome (998224422899).

The spelling of 978202220020 in words is "nine hundred seventy-eight billion, two hundred two million, two hundred twenty thousand, twenty".