20919419 has 2 divisors, whose sum is σ = 20919420. Its totient is φ = 20919418.

The previous prime is 20919383. The next prime is 20919421. The reversal of 20919419 is 91491902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20919419 is a prime.

It is a super-2 number, since 2×20919419² = 875244182595122, which contains 22 as substring.

Together with 20919421, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20919449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10459709 + 10459710.

It is an arithmetic number, because the mean of its divisors is an integer number (10459710).

Almost surely, 2^20919419 is an apocalyptic number.

20919419 is a deficient number, since it is larger than the sum of its proper divisors (1).

20919419 is an equidigital number, since it uses as much as digits as its factorization.

20919419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 20919419 is about 4573.7751365803. The cubic root of 20919419 is about 275.5390813934.

The spelling of 20919419 in words is "twenty million, nine hundred nineteen thousand, four hundred nineteen".