205020520000 has 70 divisors (see below), whose sum is σ = 508384357118. Its totient is φ = 82008192000.

The previous prime is 205020519997. The next prime is 205020520063. The reversal of 205020520000 is 25020502.

It can be written as a sum of positive squares in 5 ways, for example, as 92274997824 + 112745522176 = 303768^2 + 335776^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2522757 + ... + 2602756.

Almost surely, 2^205020520000 is an apocalyptic number.

205020520000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205020520000 is an abundant number, since it is smaller than the sum of its proper divisors (303363837118).

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

205020520000 is an frugal number, since it uses more digits than its factorization.

205020520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5125545 (or 5125520 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

Adding to 205020520000 its reverse (25020502), we get a palindrome (205045540502).

The spelling of 205020520000 in words is "two hundred five billion, twenty million, five hundred twenty thousand".