1520454420 has 72 divisors (see below), whose sum is σ = 4623879624. Its totient is φ = 404414208.

The previous prime is 1520454413. The next prime is 1520454451. The reversal of 1520454420 is 244540251.

1520454420 is a `hidden beast` number, since 15 + 204 + 5 + 442 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 24621444 + 1495832976 = 4962^2 + 38676^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60822 + ... + 82098.

Almost surely, 2^1520454420 is an apocalyptic number.

1520454420 is a gapful number since it is divisible by the number (10) 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 1520454420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2311939812).

1520454420 is an abundant number, since it is smaller than the sum of its proper divisors (3103425204).

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

1520454420 is a wasteful number, since it uses less digits than its factorization.

1520454420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21689 (or 21684 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 1520454420 is about 38993.0047572638. The cubic root of 1520454420 is about 1149.8939839257.

Adding to 1520454420 its reverse (244540251), we get a palindrome (1764994671).

The spelling of 1520454420 in words is "one billion, five hundred twenty million, four hundred fifty-four thousand, four hundred twenty".