20181072 has 20 divisors (see below), whose sum is σ = 52134560. Its totient is φ = 6727008.

The previous prime is 20181053. The next prime is 20181079. The reversal of 20181072 is 27018102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20181079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210172 + ... + 210267.

It is an arithmetic number, because the mean of its divisors is an integer number (2606728).

Almost surely, 2^20181072 is an apocalyptic number.

It is an amenable number.

20181072 is an abundant number, since it is smaller than the sum of its proper divisors (31953488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20181072 is a wasteful number, since it uses less digits than its factorization.

20181072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420450 (or 420444 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 20181072 is about 4492.3348049761. The cubic root of 20181072 is about 272.2584769027.

Adding to 20181072 its reverse (27018102), we get a palindrome (47199174).

The spelling of 20181072 in words is "twenty million, one hundred eighty-one thousand, seventy-two".