20692685 has 8 divisors (see below), whose sum is σ = 26741400. Its totient is φ = 15280704.

The previous prime is 20692681. The next prime is 20692697. The reversal of 20692685 is 58629602.

It can be written as a sum of positive squares in 4 ways, for example, as 2553604 + 18139081 = 1598^2 + 4259^2 .

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 20692685 - 2² = 20692681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20692681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159110 + ... + 159239.

It is an arithmetic number, because the mean of its divisors is an integer number (3342675).

Almost surely, 2^20692685 is an apocalyptic number.

It is an amenable number.

20692685 is a deficient number, since it is larger than the sum of its proper divisors (6048715).

20692685 is a wasteful number, since it uses less digits than its factorization.

20692685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318367.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 20692685 is about 4548.9213007042. The cubic root of 20692685 is about 274.5399912759.

It can be divided in two parts, 206 and 92685, that multiplied together give a triangular number (19093110 = T₆₁₇₉).

The spelling of 20692685 in words is "twenty million, six hundred ninety-two thousand, six hundred eighty-five".