20686365 has 48 divisors (see below), whose sum is σ = 43400448. Its totient is φ = 8898048.

The previous prime is 20686363. The next prime is 20686373. The reversal of 20686365 is 56368602.

It is not a de Polignac number, because 20686365 - 2¹ = 20686363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686363) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3424 + ... + 7286.

It is an arithmetic number, because the mean of its divisors is an integer number (904176).

Almost surely, 2^20686365 is an apocalyptic number.

It is an amenable number.

20686365 is an abundant number, since it is smaller than the sum of its proper divisors (22714083).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20686365 is a wasteful number, since it uses less digits than its factorization.

20686365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3898 (or 3895 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 20686365 is about 4548.2265774695. The cubic root of 20686365 is about 274.5120382510.

The spelling of 20686365 in words is "twenty million, six hundred eighty-six thousand, three hundred sixty-five".