19420117 has 4 divisors (see below), whose sum is σ = 19686220. Its totient is φ = 19154016.

The previous prime is 19420081. The next prime is 19420123. The reversal of 19420117 is 71102491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71102491 = 5179 ⋅13729.

It can be written as a sum of positive squares in 2 ways, for example, as 14814801 + 4605316 = 3849^2 + 2146^2 .

It is a cyclic number.

It is not a de Polignac number, because 19420117 - 2⁷ = 19419989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19420091 and 19420100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19420127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132942 + ... + 133087.

It is an arithmetic number, because the mean of its divisors is an integer number (4921555).

Almost surely, 2^19420117 is an apocalyptic number.

It is an amenable number.

19420117 is a deficient number, since it is larger than the sum of its proper divisors (266103).

19420117 is an equidigital number, since it uses as much as digits as its factorization.

19420117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266102.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 19420117 is about 4406.8261821860. The cubic root of 19420117 is about 268.7925829766.

The spelling of 19420117 in words is "nineteen million, four hundred twenty thousand, one hundred seventeen".