215420020 has 24 divisors (see below), whose sum is σ = 452944800. Its totient is φ = 86060832.

The previous prime is 215420011. The next prime is 215420041. The reversal of 215420020 is 20024512.

215420020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 215419976 and 215420003.

It is a congruent number.

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, 10911 + ... + 23449.

It is an arithmetic number, because the mean of its divisors is an integer number (18872700).

Almost surely, 2^215420020 is an apocalyptic number.

215420020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215420020 is an abundant number, since it is smaller than the sum of its proper divisors (237524780).

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

215420020 is a wasteful number, since it uses less digits than its factorization.

215420020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13407 (or 13405 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 215420020 is about 14677.1938734896. The cubic root of 215420020 is about 599.4625001151.

Adding to 215420020 its reverse (20024512), we get a palindrome (235444532).

The spelling of 215420020 in words is "two hundred fifteen million, four hundred twenty thousand, twenty".