19690085 has 8 divisors (see below), whose sum is σ = 23759736. Its totient is φ = 15664320.

The previous prime is 19690079. The next prime is 19690091. The reversal of 19690085 is 58009691.

19690085 = 28² + 29² + ... + 389².

It is an interprime number because it is at equal distance from previous prime (19690079) and next prime (19690091).

It can be written as a sum of positive squares in 4 ways, for example, as 1036324 + 18653761 = 1018^2 + 4319^2 .

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

It is not a de Polignac number, because 19690085 - 2¹⁴ = 19673701 is a prime.

It is a Duffinian number.

It is a congruent 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, 9974 + ... + 11783.

It is an arithmetic number, because the mean of its divisors is an integer number (2969967).

Almost surely, 2^19690085 is an apocalyptic number.

It is an amenable number.

19690085 is a deficient number, since it is larger than the sum of its proper divisors (4069651).

19690085 is a wasteful number, since it uses less digits than its factorization.

19690085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21943.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 19690085 is about 4437.3511242632. The cubic root of 19690085 is about 270.0323920900.

The spelling of 19690085 in words is "nineteen million, six hundred ninety thousand, eighty-five".