206413890 has 32 divisors (see below), whose sum is σ = 495771840. Its totient is φ = 55001664.

The previous prime is 206413859. The next prime is 206413897. The reversal of 206413890 is 98314602.

It is not an unprimeable number, because it can be changed into a prime (206413897) 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, 72616 + ... + 75404.

It is an arithmetic number, because the mean of its divisors is an integer number (15492870).

Almost surely, 2^206413890 is an apocalyptic number.

206413890 is an abundant number, since it is smaller than the sum of its proper divisors (289357950).

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

206413890 is a wasteful number, since it uses less digits than its factorization.

206413890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5266.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 206413890 is about 14367.1114006957. Note that the first 3 decimals coincide. The cubic root of 206413890 is about 590.9893293157.

It can be divided in two parts, 20641 and 3890, that added together give a triangular number (24531 = T₂₂₁).

The spelling of 206413890 in words is "two hundred six million, four hundred thirteen thousand, eight hundred ninety".