206090740 has 24 divisors (see below), whose sum is σ = 444489192. Its totient is φ = 80208000.

The previous prime is 206090737. The next prime is 206090747. The reversal of 206090740 is 47090602.

It can be written as a sum of positive squares in 4 ways, for example, as 15319396 + 190771344 = 3914^2 + 13812^2 .

It is a super-2 number, since 2×206090740² = 84946786227495200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 206090699 and 206090708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206090747) by changing a digit.

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, 138511 + ... + 139990.

It is an arithmetic number, because the mean of its divisors is an integer number (18520383).

Almost surely, 2^206090740 is an apocalyptic number.

206090740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206090740 is an abundant number, since it is smaller than the sum of its proper divisors (238398452).

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

206090740 is a wasteful number, since it uses less digits than its factorization.

206090740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278547 (or 278545 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 206090740 is about 14355.8608240676. The cubic root of 206090740 is about 590.6807616605.

The spelling of 206090740 in words is "two hundred six million, ninety thousand, seven hundred forty".