1889561020 has 24 divisors (see below), whose sum is σ = 4176925200. Its totient is φ = 716044032.

The previous prime is 1889561017. The next prime is 1889561057. The reversal of 1889561020 is 201659881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2485885 + ... + 2486644.

It is an arithmetic number, because the mean of its divisors is an integer number (174038550).

Almost surely, 2^1889561020 is an apocalyptic number.

1889561020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1889561020 is an abundant number, since it is smaller than the sum of its proper divisors (2287364180).

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

1889561020 is a wasteful number, since it uses less digits than its factorization.

1889561020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4972557 (or 4972555 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 1889561020 is about 43469.0811957189. The cubic root of 1889561020 is about 1236.2898596829.

The spelling of 1889561020 in words is "one billion, eight hundred eighty-nine million, five hundred sixty-one thousand, twenty".