20386641 has 8 divisors (see below), whose sum is σ = 29653344. Its totient is φ = 12355520.

The previous prime is 20386631. The next prime is 20386651. The reversal of 20386641 is 14668302.

It is an interprime number because it is at equal distance from previous prime (20386631) and next prime (20386651).

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

It is a cyclic number.

It is not a de Polignac number, because 20386641 - 2²¹ = 18289489 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20386599 and 20386608.

It is not an unprimeable number, because it can be changed into a prime (20386631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308856 + ... + 308921.

It is an arithmetic number, because the mean of its divisors is an integer number (3706668).

Almost surely, 2^20386641 is an apocalyptic number.

It is an amenable number.

20386641 is a deficient number, since it is larger than the sum of its proper divisors (9266703).

20386641 is a wasteful number, since it uses less digits than its factorization.

20386641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617791.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20386641 is about 4515.1568079082. The cubic root of 20386641 is about 273.1797847014.

The spelling of 20386641 in words is "twenty million, three hundred eighty-six thousand, six hundred forty-one".