20920285 has 8 divisors (see below), whose sum is σ = 26581176. Its totient is φ = 15751680.

The previous prime is 20920259. The next prime is 20920301. The reversal of 20920285 is 58202902.

It can be written as a sum of positive squares in 4 ways, for example, as 290521 + 20629764 = 539^2 + 4542^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20920285 - 2⁵ = 20920253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122976 + ... + 123145.

It is an arithmetic number, because the mean of its divisors is an integer number (3322647).

Almost surely, 2^20920285 is an apocalyptic number.

It is an amenable number.

20920285 is a deficient number, since it is larger than the sum of its proper divisors (5660891).

20920285 is a wasteful number, since it uses less digits than its factorization.

20920285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246143.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20920285 is about 4573.8698057553. The cubic root of 20920285 is about 275.5428834995.

The spelling of 20920285 in words is "twenty million, nine hundred twenty thousand, two hundred eighty-five".