20515400200 has 24 divisors (see below), whose sum is σ = 47698305930. Its totient is φ = 8206160000.

The previous prime is 20515400177. The next prime is 20515400203. The reversal of 20515400200 is 200451502.

It can be written as a sum of positive squares in 3 ways, for example, as 8207272836 + 12308127364 = 90594^2 + 110942^2 .

It is not an unprimeable number, because it can be changed into a prime (20515400203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51288301 + ... + 51288700.

Almost surely, 2^20515400200 is an apocalyptic number.

20515400200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20515400200 is an abundant number, since it is smaller than the sum of its proper divisors (27182905730).

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

20515400200 is a wasteful number, since it uses less digits than its factorization.

20515400200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102577017 (or 102577008 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

Adding to 20515400200 its reverse (200451502), we get a palindrome (20715851702).

The spelling of 20515400200 in words is "twenty billion, five hundred fifteen million, four hundred thousand, two hundred".