215203420 has 24 divisors (see below), whose sum is σ = 452346048. Its totient is φ = 86001600.

The previous prime is 215203411. The next prime is 215203421. The reversal of 215203420 is 24302512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215203421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20250 + ... + 28990.

It is an arithmetic number, because the mean of its divisors is an integer number (18847752).

Almost surely, 2^215203420 is an apocalyptic number.

215203420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215203420 is an abundant number, since it is smaller than the sum of its proper divisors (237142628).

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

215203420 is a wasteful number, since it uses less digits than its factorization.

215203420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9981 (or 9979 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 215203420 is about 14669.8132230782. The cubic root of 215203420 is about 599.2615173712.

Adding to 215203420 its reverse (24302512), we get a palindrome (239505932).

The spelling of 215203420 in words is "two hundred fifteen million, two hundred three thousand, four hundred twenty".