20965686 has 16 divisors (see below), whose sum is σ = 47921664. Its totient is φ = 5990184.

The previous prime is 20965669. The next prime is 20965723. The reversal of 20965686 is 68656902.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 499183 = 20965686 / (2 + 0 + 9 + 6 + 5 + 6 + 8 + 6).

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, 249550 + ... + 249633.

It is an arithmetic number, because the mean of its divisors is an integer number (2995104).

Almost surely, 2^20965686 is an apocalyptic number.

20965686 is an abundant number, since it is smaller than the sum of its proper divisors (26955978).

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

20965686 is a wasteful number, since it uses less digits than its factorization.

20965686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499195.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 20965686 is about 4578.8301999528. The cubic root of 20965686 is about 275.7420663135.

The spelling of 20965686 in words is "twenty million, nine hundred sixty-five thousand, six hundred eighty-six".