20250400520 has 48 divisors (see below), whose sum is σ = 53002328940. Its totient is φ = 6942993792.

The previous prime is 20250400481. The next prime is 20250400529. The reversal of 20250400520 is 2500405202.

It can be written as a sum of positive squares in 2 ways, for example, as 18743252836 + 1507147684 = 136906^2 + 38822^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20250400492 and 20250400501.

It is not an unprimeable number, because it can be changed into a prime (20250400529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5163959 + ... + 5167878.

Almost surely, 2^20250400520 is an apocalyptic number.

20250400520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20250400520 is an abundant number, since it is smaller than the sum of its proper divisors (32751928420).

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

20250400520 is a wasteful number, since it uses less digits than its factorization.

20250400520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10331862 (or 10331851 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

Adding to 20250400520 its reverse (2500405202), we get a palindrome (22750805722).

The spelling of 20250400520 in words is "twenty billion, two hundred fifty million, four hundred thousand, five hundred twenty".