20905095 has 16 divisors (see below), whose sum is σ = 34227072. Its totient is φ = 10889760.

The previous prime is 20905069. The next prime is 20905097. The reversal of 20905095 is 59050902.

It is not a de Polignac number, because 20905095 - 2⁸ = 20904839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20905097) 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, 15561 + ... + 16850.

It is an arithmetic number, because the mean of its divisors is an integer number (2139192).

Almost surely, 2^20905095 is an apocalyptic number.

20905095 is a deficient number, since it is larger than the sum of its proper divisors (13321977).

20905095 is a wasteful number, since it uses less digits than its factorization.

20905095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32462.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 20905095 is about 4572.2089847250. The cubic root of 20905095 is about 275.4761777507.

Adding to 20905095 its reverse (59050902), we get a palindrome (79955997).

The spelling of 20905095 in words is "twenty million, nine hundred five thousand, ninety-five".