20955405 has 32 divisors (see below), whose sum is σ = 35012736. Its totient is φ = 10692864.

The previous prime is 20955401. The next prime is 20955409. The reversal of 20955405 is 50455902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20955401) and next prime (20955409).

It is not a de Polignac number, because 20955405 - 2² = 20955401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20955401) 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 31 ways as a sum of consecutive naturals, for example, 33879 + ... + 34491.

It is an arithmetic number, because the mean of its divisors is an integer number (1094148).

Almost surely, 2^20955405 is an apocalyptic number.

It is an amenable number.

20955405 is a deficient number, since it is larger than the sum of its proper divisors (14057331).

20955405 is a wasteful number, since it uses less digits than its factorization.

20955405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 20955405 is about 4577.7073956294. The cubic root of 20955405 is about 275.6969868172.

The spelling of 20955405 in words is "twenty million, nine hundred fifty-five thousand, four hundred five".