20091920000 has 80 divisors (see below), whose sum is σ = 50017778250. Its totient is φ = 8036736000.

The previous prime is 20091919933. The next prime is 20091920011. The reversal of 20091920000 is 2919002.

It can be written as a sum of positive squares in 5 ways, for example, as 2000593984 + 18091326016 = 44728^2 + 134504^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 45575 + ... + 205574.

Almost surely, 2^20091920000 is an apocalyptic number.

20091920000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20091920000 is an abundant number, since it is smaller than the sum of its proper divisors (29925858250).

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

20091920000 is an frugal number, since it uses more digits than its factorization.

20091920000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251183 (or 251156 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 20091920000 in words is "twenty billion, ninety-one million, nine hundred twenty thousand".