198402720020 has 24 divisors (see below), whose sum is σ = 418194592200. Its totient is φ = 79066063232.

The previous prime is 198402720013. The next prime is 198402720023. The reversal of 198402720020 is 20027204891.

It can be written as a sum of positive squares in 4 ways, for example, as 5873076496 + 192529643524 = 76636^2 + 438782^2 .

It is a super-2 number, since 2×198402720020² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198402720023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18433535 + ... + 18444294.

It is an arithmetic number, because the mean of its divisors is an integer number (17424774675).

Almost surely, 2^198402720020 is an apocalyptic number.

198402720020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198402720020 is an abundant number, since it is smaller than the sum of its proper divisors (219791872180).

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

198402720020 is a wasteful number, since it uses less digits than its factorization.

198402720020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36878107 (or 36878105 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 198402720020 in words is "one hundred ninety-eight billion, four hundred two million, seven hundred twenty thousand, twenty".