19813705 has 8 divisors (see below), whose sum is σ = 24022152. Its totient is φ = 15687168.

The previous prime is 19813691. The next prime is 19813711. The reversal of 19813705 is 50731891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7338681 + 12475024 = 2709^2 + 3532^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 19813705 - 2¹¹ = 19811657 is a prime.

It is a super-3 number, since 3×19813705³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19942 + ... + 20911.

It is an arithmetic number, because the mean of its divisors is an integer number (3002769).

Almost surely, 2^19813705 is an apocalyptic number.

It is an amenable number.

19813705 is a deficient number, since it is larger than the sum of its proper divisors (4208447).

19813705 is an equidigital number, since it uses as much as digits as its factorization.

19813705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40955.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 19813705 is about 4451.2588107186. The cubic root of 19813705 is about 270.5963271469.

The spelling of 19813705 in words is "nineteen million, eight hundred thirteen thousand, seven hundred five".