8100000020 has 48 divisors (see below), whose sum is σ = 19632509568. Its totient is φ = 2749641600.

The previous prime is 8099999993. The next prime is 8100000023. The reversal of 8100000020 is 200000018.

It is a super-2 number, since 2×8100000020² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8099999947 and 8100000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8100000023) 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, 272282 + ... + 300561.

It is an arithmetic number, because the mean of its divisors is an integer number (409010616).

Almost surely, 2^8100000020 is an apocalyptic number.

It is an amenable number.

8100000020 is an abundant number, since it is smaller than the sum of its proper divisors (11532509548).

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

8100000020 is a wasteful number, since it uses less digits than its factorization.

8100000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572960 (or 572958 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 8100000020 is about 90000.0001111111. Note that the first 3 decimals coincide. The cubic root of 8100000020 is about 2008.2988518994.

Adding to 8100000020 its reverse (200000018), we get a palindrome (8300000038).

The spelling of 8100000020 in words is "eight billion, one hundred million, twenty", and thus it is an aban number.