1909201020 has 48 divisors (see below), whose sum is σ = 5578191360. Its totient is φ = 486984256.

The previous prime is 1909201013. The next prime is 1909201027. The reversal of 1909201020 is 201029091.

It is an interprime number because it is at equal distance from previous prime (1909201013) and next prime (1909201027).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909201027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690360 + ... + 693119.

It is an arithmetic number, because the mean of its divisors is an integer number (116212320).

Almost surely, 2^1909201020 is an apocalyptic number.

1909201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1909201020 is an abundant number, since it is smaller than the sum of its proper divisors (3668990340).

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

1909201020 is a wasteful number, since it uses less digits than its factorization.

1909201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383514 (or 1383512 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1909201020 is about 43694.4049049761. The cubic root of 1909201020 is about 1240.5584156750.

The spelling of 1909201020 in words is "one billion, nine hundred nine million, two hundred one thousand, twenty".