20966919 has 8 divisors (see below), whose sum is σ = 27991152. Its totient is φ = 13960320.

The previous prime is 20966903. The next prime is 20966921. The reversal of 20966919 is 91966902.

It is a happy number.

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

It is not a de Polignac number, because 20966919 - 2⁴ = 20966903 is a prime.

It is a super-2 number, since 2×20966919² = 879223384705122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20966969) 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, 1324 + ... + 6609.

It is an arithmetic number, because the mean of its divisors is an integer number (3498894).

Almost surely, 2^20966919 is an apocalyptic number.

20966919 is a deficient number, since it is larger than the sum of its proper divisors (7024233).

20966919 is an equidigital number, since it uses as much as digits as its factorization.

20966919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8817.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 20966919 is about 4578.9648393496. The cubic root of 20966919 is about 275.7474717063.

The spelling of 20966919 in words is "twenty million, nine hundred sixty-six thousand, nine hundred nineteen".