1995563620 has 48 divisors (see below), whose sum is σ = 4335948288. Its totient is φ = 770676480.

The previous prime is 1995563611. The next prime is 1995563629. The reversal of 1995563620 is 263655991.

It is an interprime number because it is at equal distance from previous prime (1995563611) and next prime (1995563629).

It is a super-2 number, since 2×1995563620² = 7964548322935008800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1995563629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279819 + ... + 286861.

It is an arithmetic number, because the mean of its divisors is an integer number (90332256).

Almost surely, 2^1995563620 is an apocalyptic number.

1995563620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1995563620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2167974144).

1995563620 is an abundant number, since it is smaller than the sum of its proper divisors (2340384668).

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

1995563620 is a wasteful number, since it uses less digits than its factorization.

1995563620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7540 (or 7538 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 46.

The square root of 1995563620 is about 44671.7317774899. The cubic root of 1995563620 is about 1258.9887788120.

The spelling of 1995563620 in words is "one billion, nine hundred ninety-five million, five hundred sixty-three thousand, six hundred twenty".