15420203505 has 48 divisors (see below), whose sum is σ = 30619854720. Its totient is φ = 7032351744.

The previous prime is 15420203473. The next prime is 15420203507. The reversal of 15420203505 is 50530202451.

It is a happy number.

15420203505 is a `hidden beast` number, since 154 + 2 + 0 + 2 + 0 + 3 + 505 = 666.

It is not a de Polignac number, because 15420203505 - 2⁵ = 15420203473 is a prime.

It is a super-2 number, since 2×15420203505² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15420203507) 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 47 ways as a sum of consecutive naturals, for example, 73569 + ... + 190401.

It is an arithmetic number, because the mean of its divisors is an integer number (637913640).

Almost surely, 2^15420203505 is an apocalyptic number.

15420203505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15420203505 is a deficient number, since it is larger than the sum of its proper divisors (15199651215).

15420203505 is a wasteful number, since it uses less digits than its factorization.

15420203505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117270 (or 117267 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 15420203505 its reverse (50530202451), we get a palindrome (65950405956).

The spelling of 15420203505 in words is "fifteen billion, four hundred twenty million, two hundred three thousand, five hundred five".