205542007 has 16 divisors (see below), whose sum is σ = 235855872. Its totient is φ = 177297120.

The previous prime is 205541989. The next prime is 205542011. The reversal of 205542007 is 700245502.

It is a de Polignac number, because none of the positive numbers 2^k-205542007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205542037) 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, 28933 + ... + 35329.

It is an arithmetic number, because the mean of its divisors is an integer number (14740992).

Almost surely, 2^205542007 is an apocalyptic number.

205542007 is a deficient number, since it is larger than the sum of its proper divisors (30313865).

205542007 is a wasteful number, since it uses less digits than its factorization.

205542007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6558.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 205542007 is about 14336.7362743408. The cubic root of 205542007 is about 590.1560508411.

Adding to 205542007 its reverse (700245502), we get a palindrome (905787509).

The spelling of 205542007 in words is "two hundred five million, five hundred forty-two thousand, seven".