206142645 has 16 divisors (see below), whose sum is σ = 337499712. Its totient is φ = 107385600.

The previous prime is 206142641. The next prime is 206142649. The reversal of 206142645 is 546241602.

It is an interprime number because it is at equal distance from previous prime (206142641) and next prime (206142649).

It is not a de Polignac number, because 206142645 - 2² = 206142641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206142641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159156 + ... + 160445.

It is an arithmetic number, because the mean of its divisors is an integer number (21093732).

Almost surely, 2^206142645 is an apocalyptic number.

It is an amenable number.

206142645 is a deficient number, since it is larger than the sum of its proper divisors (131357067).

206142645 is a wasteful number, since it uses less digits than its factorization.

206142645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319652.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 206142645 is about 14357.6685085010. The cubic root of 206142645 is about 590.7303461483.

The spelling of 206142645 in words is "two hundred six million, one hundred forty-two thousand, six hundred forty-five".