206001540 has 36 divisors (see below), whose sum is σ = 624871884. Its totient is φ = 54933696.

The previous prime is 206001539. The next prime is 206001577. The reversal of 206001540 is 45100602.

It is a happy number.

206001540 is a `hidden beast` number, since 20 + 600 + 1 + 5 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 90782784 + 115218756 = 9528^2 + 10734^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 572047 + ... + 572406.

Almost surely, 2^206001540 is an apocalyptic number.

206001540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206001540 is an abundant number, since it is smaller than the sum of its proper divisors (418870344).

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

206001540 is a wasteful number, since it uses less digits than its factorization.

206001540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144468 (or 1144463 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 206001540 is about 14352.7537427492. The cubic root of 206001540 is about 590.5955300657.

The spelling of 206001540 in words is "two hundred six million, one thousand, five hundred forty".