1995990020 has 24 divisors (see below), whose sum is σ = 4200000000. Its totient is φ = 796792032.

The previous prime is 1995990019. The next prime is 1995990023. The reversal of 1995990020 is 200995991.

It is not an unprimeable number, because it can be changed into a prime (1995990023) 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, 90020 + ... + 109979.

It is an arithmetic number, because the mean of its divisors is an integer number (175000000).

Almost surely, 2^1995990020 is an apocalyptic number.

1995990020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1995990020 is an abundant number, since it is smaller than the sum of its proper divisors (2204009980).

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

1995990020 is a wasteful number, since it uses less digits than its factorization.

1995990020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200507 (or 200505 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 1995990020 is about 44676.5041156982. The cubic root of 1995990020 is about 1259.0784434693.

The spelling of 1995990020 in words is "one billion, nine hundred ninety-five million, nine hundred ninety thousand, twenty".