206157220 has 24 divisors (see below), whose sum is σ = 455716800. Its totient is φ = 78122592.

The previous prime is 206157167. The next prime is 206157253. The reversal of 206157220 is 22751602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270880 + ... + 271639.

It is an arithmetic number, because the mean of its divisors is an integer number (18988200).

Almost surely, 2^206157220 is an apocalyptic number.

206157220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206157220 is an abundant number, since it is smaller than the sum of its proper divisors (249559580).

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

206157220 is a wasteful number, since it uses less digits than its factorization.

206157220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542547 (or 542545 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 206157220 is about 14358.1760680109. The cubic root of 206157220 is about 590.7442680484.

The spelling of 206157220 in words is "two hundred six million, one hundred fifty-seven thousand, two hundred twenty".