20949285 has 32 divisors (see below), whose sum is σ = 38633472. Its totient is φ = 9495360.

The previous prime is 20949259. The next prime is 20949301. The reversal of 20949285 is 58294902.

It is not a de Polignac number, because 20949285 - 2⁶ = 20949221 is a prime.

It is a super-2 number, since 2×20949285² = 877745084022450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12550 + ... + 14120.

It is an arithmetic number, because the mean of its divisors is an integer number (1207296).

Almost surely, 2^20949285 is an apocalyptic number.

It is an amenable number.

20949285 is a deficient number, since it is larger than the sum of its proper divisors (17684187).

20949285 is a wasteful number, since it uses less digits than its factorization.

20949285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 20949285 is about 4577.0388899375. The cubic root of 20949285 is about 275.6701452165.

It can be divided in two parts, 209 and 49285, that added together give a palindrome (49494).

The spelling of 20949285 in words is "twenty million, nine hundred forty-nine thousand, two hundred eighty-five".