20946919 has 4 divisors (see below), whose sum is σ = 23939344. Its totient is φ = 17954496.

The previous prime is 20946901. The next prime is 20946931. The reversal of 20946919 is 91964902.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20946919 - 2⁹ = 20946407 is a prime.

It is a super-2 number, since 2×20946919² = 877546831185122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20946319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1496202 + ... + 1496215.

It is an arithmetic number, because the mean of its divisors is an integer number (5984836).

Almost surely, 2^20946919 is an apocalyptic number.

20946919 is a deficient number, since it is larger than the sum of its proper divisors (2992425).

20946919 is an equidigital number, since it uses as much as digits as its factorization.

20946919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2992424.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 20946919 is about 4576.7804185912. The cubic root of 20946919 is about 275.6597668174.

The spelling of 20946919 in words is "twenty million, nine hundred forty-six thousand, nine hundred nineteen".