20685435 has 8 divisors (see below), whose sum is σ = 33096720. Its totient is φ = 11032224.

The previous prime is 20685421. The next prime is 20685449. The reversal of 20685435 is 53458602.

It is an interprime number because it is at equal distance from previous prime (20685421) and next prime (20685449).

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

It is not a de Polignac number, because 20685435 - 2⁵ = 20685403 is a prime.

It is a super-2 number, since 2×20685435² = 855774442278450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20685396 and 20685405.

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, 689500 + ... + 689529.

It is an arithmetic number, because the mean of its divisors is an integer number (4137090).

Almost surely, 2^20685435 is an apocalyptic number.

20685435 is a deficient number, since it is larger than the sum of its proper divisors (12411285).

20685435 is a wasteful number, since it uses less digits than its factorization.

20685435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379037.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 20685435 is about 4548.1243386697. The cubic root of 20685435 is about 274.5079244297.

It can be divided in two parts, 2068 and 5435, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 20685435 in words is "twenty million, six hundred eighty-five thousand, four hundred thirty-five".