20951205 has 64 divisors (see below), whose sum is σ = 39674880. Its totient is φ = 9331200.

The previous prime is 20951201. The next prime is 20951209. The reversal of 20951205 is 50215902.

It is an interprime number because it is at equal distance from previous prime (20951201) and next prime (20951209).

It is not a de Polignac number, because 20951205 - 2² = 20951201 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20951201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 128454 + ... + 128616.

It is an arithmetic number, because the mean of its divisors is an integer number (619920).

Almost surely, 2^20951205 is an apocalyptic number.

It is an amenable number.

20951205 is a deficient number, since it is larger than the sum of its proper divisors (18723675).

20951205 is a wasteful number, since it uses less digits than its factorization.

20951205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 20951205 is about 4577.2486277239. The cubic root of 20951205 is about 275.6785666735.

The spelling of 20951205 in words is "twenty million, nine hundred fifty-one thousand, two hundred five".