20211285 has 16 divisors (see below), whose sum is σ = 32949504. Its totient is φ = 10575552.

The previous prime is 20211263. The next prime is 20211377. The reversal of 20211285 is 58211202.

It is a happy number.

It is not a de Polignac number, because 20211285 - 2⁵ = 20211253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11917 + ... + 13506.

It is an arithmetic number, because the mean of its divisors is an integer number (2059344).

Almost surely, 2^20211285 is an apocalyptic number.

It is an amenable number.

20211285 is a deficient number, since it is larger than the sum of its proper divisors (12738219).

20211285 is a wasteful number, since it uses less digits than its factorization.

20211285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25484.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20211285 is about 4495.6962753282. The cubic root of 20211285 is about 272.3942748403.

Adding to 20211285 its reverse (58211202), we get a palindrome (78422487).

The spelling of 20211285 in words is "twenty million, two hundred eleven thousand, two hundred eighty-five".