2020191820 has 24 divisors (see below), whose sum is σ = 4252264128. Its totient is φ = 806198400.

The previous prime is 2020191809. The next prime is 2020191827. The reversal of 2020191820 is 281910202.

It is not an unprimeable number, because it can be changed into a prime (2020191827) 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, 108561 + ... + 125800.

It is an arithmetic number, because the mean of its divisors is an integer number (177177672).

Almost surely, 2^2020191820 is an apocalyptic number.

2020191820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2020191820 is an abundant number, since it is smaller than the sum of its proper divisors (2232072308).

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

2020191820 is a wasteful number, since it uses less digits than its factorization.

2020191820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234801 (or 234799 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 2020191820 is about 44946.5440273221. The cubic root of 2020191820 is about 1264.1468769596.

The spelling of 2020191820 in words is "two billion, twenty million, one hundred ninety-one thousand, eight hundred twenty".