20366646 has 16 divisors (see below), whose sum is σ = 43129584. Its totient is φ = 6389504.

The previous prime is 20366641. The next prime is 20366657. The reversal of 20366646 is 64666302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20366641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99735 + ... + 99938.

It is an arithmetic number, because the mean of its divisors is an integer number (2695599).

Almost surely, 2^20366646 is an apocalyptic number.

20366646 is an abundant number, since it is smaller than the sum of its proper divisors (22762938).

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

20366646 is a wasteful number, since it uses less digits than its factorization.

20366646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199695.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 20366646 is about 4512.9420559099. The cubic root of 20366646 is about 273.0904448810.

It can be divided in two parts, 20366 and 646, that added together give a palindrome (21012).

The spelling of 20366646 in words is "twenty million, three hundred sixty-six thousand, six hundred forty-six".