15505420 has 24 divisors (see below), whose sum is σ = 37213344. Its totient is φ = 5316096.

The previous prime is 15505417. The next prime is 15505433. The reversal of 15505420 is 2450551.

It is a junction number, because it is equal to n+sod(n) for n = 15505391 and 15505400.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55237 + ... + 55516.

It is an arithmetic number, because the mean of its divisors is an integer number (1550556).

Almost surely, 2^15505420 is an apocalyptic number.

15505420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15505420 is an abundant number, since it is smaller than the sum of its proper divisors (21707924).

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

15505420 is a wasteful number, since it uses less digits than its factorization.

15505420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110769 (or 110767 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 15505420 is about 3937.6922175305. The cubic root of 15505420 is about 249.3606060959.

Adding to 15505420 its reverse (2450551), we get a palindrome (17955971).

The spelling of 15505420 in words is "fifteen million, five hundred five thousand, four hundred twenty".