20105955 has 16 divisors (see below), whose sum is σ = 35744160. Its totient is φ = 10723104.

The previous prime is 20105947. The next prime is 20105957. The reversal of 20105955 is 55950102.

It is not a de Polignac number, because 20105955 - 2³ = 20105947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20105957) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 74332 + ... + 74601.

It is an arithmetic number, because the mean of its divisors is an integer number (2234010).

Almost surely, 2^20105955 is an apocalyptic number.

20105955 is a deficient number, since it is larger than the sum of its proper divisors (15638205).

20105955 is a wasteful number, since it uses less digits than its factorization.

20105955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148947 (or 148941 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 20105955 is about 4483.9664360920. The cubic root of 20105955 is about 271.9202611923.

The spelling of 20105955 in words is "twenty million, one hundred five thousand, nine hundred fifty-five".