189468642020 has 36 divisors (see below), whose sum is σ = 462844827900. Its totient is φ = 64960676928.

The previous prime is 189468642007. The next prime is 189468642023. The reversal of 189468642020 is 20246864981.

It can be written as a sum of positive squares in 2 ways, for example, as 112294690816 + 77173951204 = 335104^2 + 277802^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 189468642020.

It is not an unprimeable number, because it can be changed into a prime (189468642023) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 96666695 + ... + 96668654.

It is an arithmetic number, because the mean of its divisors is an integer number (12856800775).

Almost surely, 2^189468642020 is an apocalyptic number.

189468642020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189468642020 is an abundant number, since it is smaller than the sum of its proper divisors (273376185880).

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

189468642020 is a wasteful number, since it uses less digits than its factorization.

189468642020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193335372 (or 193335363 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 189468642020 in words is "one hundred eighty-nine billion, four hundred sixty-eight million, six hundred forty-two thousand, twenty".