206426740 has 72 divisors (see below), whose sum is σ = 473611320. Its totient is φ = 75538944.

The previous prime is 206426687. The next prime is 206426743. The reversal of 206426740 is 47624602.

206426740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 163942416 + 42484324 = 12804^2 + 6518^2 .

It is a super-2 number, since 2×206426740² = 85223997974055200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206426743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 530466 + ... + 530854.

It is an arithmetic number, because the mean of its divisors is an integer number (6577935).

Almost surely, 2^206426740 is an apocalyptic number.

206426740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206426740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236805660).

206426740 is an abundant number, since it is smaller than the sum of its proper divisors (267184580).

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

206426740 is a wasteful number, since it uses less digits than its factorization.

206426740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 566 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 206426740 is about 14367.5585956696. The cubic root of 206426740 is about 591.0015927916.

The spelling of 206426740 in words is "two hundred six million, four hundred twenty-six thousand, seven hundred forty".