20005755 has 32 divisors (see below), whose sum is σ = 39909888. Its totient is φ = 8313600.

The previous prime is 20005729. The next prime is 20005763. The reversal of 20005755 is 55750002.

It is not a de Polignac number, because 20005755 - 2¹⁰ = 20004731 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 7506 + ... + 9815.

It is an arithmetic number, because the mean of its divisors is an integer number (1247184).

Almost surely, 2^20005755 is an apocalyptic number.

20005755 is a deficient number, since it is larger than the sum of its proper divisors (19904133).

20005755 is a wasteful number, since it uses less digits than its factorization.

20005755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17347.

The product of its (nonzero) digits is 1750, while the sum is 24.

The square root of 20005755 is about 4472.7793372801. The cubic root of 20005755 is about 271.4677949516.

Adding to 20005755 its reverse (55750002), we get a palindrome (75755757).

The spelling of 20005755 in words is "twenty million, five thousand, seven hundred fifty-five".