20475955 has 16 divisors (see below), whose sum is σ = 25369344. Its totient is φ = 15855840.

The previous prime is 20475953. The next prime is 20475971. The reversal of 20475955 is 55957402.

It is not a de Polignac number, because 20475955 - 2¹ = 20475953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20475953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27802 + ... + 28528.

It is an arithmetic number, because the mean of its divisors is an integer number (1585584).

Almost surely, 2^20475955 is an apocalyptic number.

20475955 is a deficient number, since it is larger than the sum of its proper divisors (4893389).

20475955 is a wasteful number, since it uses less digits than its factorization.

20475955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 20475955 is about 4525.0364639415. The cubic root of 20475955 is about 273.5781376450.

The spelling of 20475955 in words is "twenty million, four hundred seventy-five thousand, nine hundred fifty-five".