15520430420 has 36 divisors (see below), whose sum is σ = 35825263572. Its totient is φ = 5643792000.

The previous prime is 15520430417. The next prime is 15520430423. The reversal of 15520430420 is 2403402551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15520430417) and next prime (15520430423).

It can be written as a sum of positive squares in 2 ways, for example, as 11100308164 + 4420122256 = 105358^2 + 66484^2 .

It is a super-2 number, since 2×15520430420² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15520430420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15520430423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3204281 + ... + 3209120.

Almost surely, 2^15520430420 is an apocalyptic number.

15520430420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15520430420 is an abundant number, since it is smaller than the sum of its proper divisors (20304833152).

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

15520430420 is a wasteful number, since it uses less digits than its factorization.

15520430420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6413432 (or 6413419 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 15520430420 its reverse (2403402551), we get a palindrome (17923832971).

The spelling of 15520430420 in words is "fifteen billion, five hundred twenty million, four hundred thirty thousand, four hundred twenty".