1989617020 has 24 divisors (see below), whose sum is σ = 4180693104. Its totient is φ = 795371136.

The previous prime is 1989616973. The next prime is 1989617023. The reversal of 1989617020 is 207169891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989617023) 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, 5592 + ... + 63328.

It is an arithmetic number, because the mean of its divisors is an integer number (174195546).

Almost surely, 2^1989617020 is an apocalyptic number.

1989617020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989617020 is an abundant number, since it is smaller than the sum of its proper divisors (2191076084).

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

1989617020 is a wasteful number, since it uses less digits than its factorization.

1989617020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59469 (or 59467 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 1989617020 is about 44605.1232483445. The cubic root of 1989617020 is about 1257.7369768149.

The spelling of 1989617020 in words is "one billion, nine hundred eighty-nine million, six hundred seventeen thousand, twenty".