206412540 has 24 divisors (see below), whose sum is σ = 577955280. Its totient is φ = 55043328.

The previous prime is 206412533. The next prime is 206412541. The reversal of 206412540 is 45214602.

It is a super-2 number, since 2×206412540² = 85212273338503200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206412540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206412541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1720045 + ... + 1720164.

It is an arithmetic number, because the mean of its divisors is an integer number (24081470).

Almost surely, 2^206412540 is an apocalyptic number.

206412540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206412540 is an abundant number, since it is smaller than the sum of its proper divisors (371542740).

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

206412540 is a wasteful number, since it uses less digits than its factorization.

206412540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440221 (or 3440219 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 206412540 is about 14367.0644183146. The cubic root of 206412540 is about 590.9880409054.

The spelling of 206412540 in words is "two hundred six million, four hundred twelve thousand, five hundred forty".