20100755 has 4 divisors (see below), whose sum is σ = 24120912. Its totient is φ = 16080600.

The previous prime is 20100733. The next prime is 20100809. The reversal of 20100755 is 55700102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55700102 = 2 ⋅27850051.

It is a de Polignac number, because none of the positive numbers 2^k-20100755 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 2010071 + ... + 2010080.

It is an arithmetic number, because the mean of its divisors is an integer number (6030228).

Almost surely, 2^20100755 is an apocalyptic number.

20100755 is a deficient number, since it is larger than the sum of its proper divisors (4020157).

20100755 is an equidigital number, since it uses as much as digits as its factorization.

20100755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020156.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 20100755 is about 4483.3865548266. The cubic root of 20100755 is about 271.8968169395.

Adding to 20100755 its reverse (55700102), we get a palindrome (75800857).

The spelling of 20100755 in words is "twenty million, one hundred thousand, seven hundred fifty-five".