2091505920 has 576 divisors, whose sum is σ = 8476876800. Its totient is φ = 428212224.

The previous prime is 2091505907. The next prime is 2091505931. The reversal of 2091505920 is 295051902.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10509981 + ... + 10510179.

It is an arithmetic number, because the mean of its divisors is an integer number (14716800).

Almost surely, 2^2091505920 is an apocalyptic number.

2091505920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2091505920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4238438400).

2091505920 is an abundant number, since it is smaller than the sum of its proper divisors (6385370880).

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

2091505920 is a wasteful number, since it uses less digits than its factorization.

2091505920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 2091505920 is about 45732.9850326873. The cubic root of 2091505920 is about 1278.8502696739.

The spelling of 2091505920 in words is "two billion, ninety-one million, five hundred five thousand, nine hundred twenty".