20902365 has 24 divisors (see below), whose sum is σ = 39525408. Its totient is φ = 10134240.

The previous prime is 20902313. The next prime is 20902381. The reversal of 20902365 is 56320902.

It is not a de Polignac number, because 20902365 - 2⁷ = 20902237 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20619 + ... + 21608.

It is an arithmetic number, because the mean of its divisors is an integer number (1646892).

Almost surely, 2^20902365 is an apocalyptic number.

It is an amenable number.

20902365 is a deficient number, since it is larger than the sum of its proper divisors (18623043).

20902365 is a wasteful number, since it uses less digits than its factorization.

20902365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42249 (or 42246 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20902365 is about 4571.9104321935. The cubic root of 20902365 is about 275.4641857347.

The spelling of 20902365 in words is "twenty million, nine hundred two thousand, three hundred sixty-five".