20466649 has 4 divisors (see below), whose sum is σ = 23390464. Its totient is φ = 17542836.

The previous prime is 20466643. The next prime is 20466653. The reversal of 20466649 is 94666402.

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 not a de Polignac number, because 20466649 - 2⁵ = 20466617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20466643) 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 3 ways as a sum of consecutive naturals, for example, 1461897 + ... + 1461910.

It is an arithmetic number, because the mean of its divisors is an integer number (5847616).

Almost surely, 2^20466649 is an apocalyptic number.

It is an amenable number.

20466649 is a deficient number, since it is larger than the sum of its proper divisors (2923815).

20466649 is an equidigital number, since it uses as much as digits as its factorization.

20466649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923814.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 20466649 is about 4524.0080680741. The cubic root of 20466649 is about 273.5366857088.

It can be divided in two parts, 20466 and 649, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20466649 in words is "twenty million, four hundred sixty-six thousand, six hundred forty-nine".