206135420 has 24 divisors (see below), whose sum is σ = 442096704. Its totient is φ = 80699456.

The previous prime is 206135417. The next prime is 206135437. The reversal of 206135420 is 24531602.

It is a super-2 number, since 2×206135420² = 84983622757152800, which contains 22 as substring.

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, 108707 + ... + 110586.

It is an arithmetic number, because the mean of its divisors is an integer number (18420696).

Almost surely, 2^206135420 is an apocalyptic number.

206135420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206135420 is an abundant number, since it is smaller than the sum of its proper divisors (235961284).

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

206135420 is a wasteful number, since it uses less digits than its factorization.

206135420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219349 (or 219347 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 206135420 is about 14357.4168985929. The cubic root of 206135420 is about 590.7234446544.

The spelling of 206135420 in words is "two hundred six million, one hundred thirty-five thousand, four hundred twenty".