206157740 has 24 divisors (see below), whose sum is σ = 451755360. Its totient is φ = 78877568.

The previous prime is 206157739. The next prime is 206157769. The reversal of 206157740 is 47751602.

It is a junction number, because it is equal to n+sod(n) for n = 206157697 and 206157706.

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, 223625 + ... + 224544.

It is an arithmetic number, because the mean of its divisors is an integer number (18823140).

Almost surely, 2^206157740 is an apocalyptic number.

206157740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206157740 is an abundant number, since it is smaller than the sum of its proper divisors (245597620).

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

206157740 is a wasteful number, since it uses less digits than its factorization.

206157740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448201 (or 448199 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 206157740 is about 14358.1941761490. The cubic root of 206157740 is about 590.7447647352.

The spelling of 206157740 in words is "two hundred six million, one hundred fifty-seven thousand, seven hundred forty".