2051420240 has 80 divisors (see below), whose sum is σ = 4966463376. Its totient is φ = 787353600.

The previous prime is 2051420213. The next prime is 2051420249. The reversal of 2051420240 is 420241502.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1202979856 + 848440384 = 34684^2 + 29128^2 .

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051420249) 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, 194954 + ... + 205206.

Almost surely, 2^2051420240 is an apocalyptic number.

2051420240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2051420240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2483231688).

2051420240 is an abundant number, since it is smaller than the sum of its proper divisors (2915043136).

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

2051420240 is a wasteful number, since it uses less digits than its factorization.

2051420240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10368 (or 10362 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 2051420240 is about 45292.6069022307. The cubic root of 2051420240 is about 1270.6273875379.

Adding to 2051420240 its reverse (420241502), we get a palindrome (2471661742).

The spelling of 2051420240 in words is "two billion, fifty-one million, four hundred twenty thousand, two hundred forty".