215020540 has 24 divisors (see below), whose sum is σ = 516049632. Its totient is φ = 73721280.

The previous prime is 215020517. The next prime is 215020567. The reversal of 215020540 is 45020512.

It is a congruent number.

It is an unprimeable number.

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, 767791 + ... + 768070.

It is an arithmetic number, because the mean of its divisors is an integer number (21502068).

Almost surely, 2^215020540 is an apocalyptic number.

215020540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215020540 is an abundant number, since it is smaller than the sum of its proper divisors (301029092).

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

215020540 is a wasteful number, since it uses less digits than its factorization.

215020540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535877 (or 1535875 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 215020540 is about 14663.5786900743. The cubic root of 215020540 is about 599.0917183271.

The spelling of 215020540 in words is "two hundred fifteen million, twenty thousand, five hundred forty".