20366081 has 4 divisors (see below), whose sum is σ = 21438000. Its totient is φ = 19294164.

The previous prime is 20366069. The next prime is 20366089. The reversal of 20366081 is 18066302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20366081 is a prime.

It is a super-2 number, since 2×20366081² = 829554510597122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20366081.

It is not an unprimeable number, because it can be changed into a prime (20366089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535931 + ... + 535968.

It is an arithmetic number, because the mean of its divisors is an integer number (5359500).

Almost surely, 2^20366081 is an apocalyptic number.

It is an amenable number.

20366081 is a deficient number, since it is larger than the sum of its proper divisors (1071919).

20366081 is a wasteful number, since it uses less digits than its factorization.

20366081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071918.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20366081 is about 4512.8794577298. The cubic root of 20366081 is about 273.0879195507.

The spelling of 20366081 in words is "twenty million, three hundred sixty-six thousand, eighty-one".