2551520420 has 24 divisors (see below), whose sum is σ = 5379550848. Its totient is φ = 1016540000.

The previous prime is 2551520417. The next prime is 2551520423. The reversal of 2551520420 is 240251552.

It is an interprime number because it is at equal distance from previous prime (2551520417) and next prime (2551520423).

It is a self number, because there is not a number n which added to its sum of digits gives 2551520420.

It is not an unprimeable number, because it can be changed into a prime (2551520423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249116 + ... + 259155.

It is an arithmetic number, because the mean of its divisors is an integer number (224147952).

Almost surely, 2^2551520420 is an apocalyptic number.

2551520420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2551520420 is an abundant number, since it is smaller than the sum of its proper divisors (2828030428).

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

2551520420 is a wasteful number, since it uses less digits than its factorization.

2551520420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508531 (or 508529 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 2551520420 is about 50512.5768497312. The cubic root of 2551520420 is about 1366.4686826692.

Adding to 2551520420 its reverse (240251552), we get a palindrome (2791771972).

The spelling of 2551520420 in words is "two billion, five hundred fifty-one million, five hundred twenty thousand, four hundred twenty".