2019900020 has 24 divisors (see below), whose sum is σ = 4426216704. Its totient is φ = 772831136.

The previous prime is 2019900019. The next prime is 2019900023. The reversal of 2019900020 is 200099102.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2019900023) 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, 2195084 + ... + 2196003.

It is an arithmetic number, because the mean of its divisors is an integer number (184425696).

Almost surely, 2^2019900020 is an apocalyptic number.

2019900020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2019900020 is an abundant number, since it is smaller than the sum of its proper divisors (2406316684).

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

2019900020 is a wasteful number, since it uses less digits than its factorization.

2019900020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4391119 (or 4391117 counting only the distinct ones).

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

The square root of 2019900020 is about 44943.2978318236. The cubic root of 2019900020 is about 1264.0860088419.

Adding to 2019900020 its reverse (200099102), we get a palindrome (2219999122).

The spelling of 2019900020 in words is "two billion, nineteen million, nine hundred thousand, twenty".