20145885 has 8 divisors (see below), whose sum is σ = 32233440. Its totient is φ = 10744464.

The previous prime is 20145863. The next prime is 20145889. The reversal of 20145885 is 58854102.

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

It is not a de Polignac number, because 20145885 - 2⁶ = 20145821 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671515 + ... + 671544.

It is an arithmetic number, because the mean of its divisors is an integer number (4029180).

Almost surely, 2^20145885 is an apocalyptic number.

It is an amenable number.

20145885 is a deficient number, since it is larger than the sum of its proper divisors (12087555).

20145885 is a wasteful number, since it uses less digits than its factorization.

20145885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343067.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 20145885 is about 4488.4167587246. The cubic root of 20145885 is about 272.1001514483.

Adding to 20145885 its reverse (58854102), we get a palindrome (78999987).

The spelling of 20145885 in words is "twenty million, one hundred forty-five thousand, eight hundred eighty-five".