20396885 has 8 divisors (see below), whose sum is σ = 25073496. Its totient is φ = 15919360.

The previous prime is 20396867. The next prime is 20396933. The reversal of 20396885 is 58869302.

20396885 = 3193² + 3194².

It can be written as a sum of positive squares in 4 ways, for example, as 128881 + 20268004 = 359^2 + 4502^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-20396885 is a prime.

It is a super-3 number, since 3×20396885³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

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, 49544 + ... + 49953.

It is an arithmetic number, because the mean of its divisors is an integer number (3134187).

Almost surely, 2^20396885 is an apocalyptic number.

20396885 is the 3194-th centered square number.

It is an amenable number.

20396885 is a deficient number, since it is larger than the sum of its proper divisors (4676611).

20396885 is an equidigital number, since it uses as much as digits as its factorization.

20396885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99543.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 20396885 is about 4516.2910667936. The cubic root of 20396885 is about 273.2255333711.

The spelling of 20396885 in words is "twenty million, three hundred ninety-six thousand, eight hundred eighty-five".