20319685 has 8 divisors (see below), whose sum is σ = 24625656. Its totient is φ = 16094400.

The previous prime is 20319667. The next prime is 20319701. The reversal of 20319685 is 58691302.

It can be written as a sum of positive squares in 4 ways, for example, as 9449476 + 10870209 = 3074^2 + 3297^2 .

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

It is not a de Polignac number, because 20319685 - 2¹⁷ = 20188613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20319685.

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, 19614 + ... + 20623.

It is an arithmetic number, because the mean of its divisors is an integer number (3078207).

Almost surely, 2^20319685 is an apocalyptic number.

It is an amenable number.

20319685 is a deficient number, since it is larger than the sum of its proper divisors (4305971).

20319685 is a wasteful number, since it uses less digits than its factorization.

20319685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40343.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20319685 is about 4507.7361280359. The cubic root of 20319685 is about 272.8803878769.

The spelling of 20319685 in words is "twenty million, three hundred nineteen thousand, six hundred eighty-five".