20813072 has 20 divisors (see below), whose sum is σ = 46086336. Its totient is φ = 8919840.

The previous prime is 20813063. The next prime is 20813077. The reversal of 20813072 is 27031802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20813077) 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, 92804 + ... + 93027.

Almost surely, 2^20813072 is an apocalyptic number.

It is an amenable number.

20813072 is an abundant number, since it is smaller than the sum of its proper divisors (25273264).

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

20813072 is a wasteful number, since it uses less digits than its factorization.

20813072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185846 (or 185840 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20813072 is about 4562.1345881068. The cubic root of 20813072 is about 275.0713732098.

Adding to 20813072 its reverse (27031802), we get a palindrome (47844874).

It can be divided in two parts, 2081307 and 2, that multiplied together give a palindrome (4162614).

The spelling of 20813072 in words is "twenty million, eight hundred thirteen thousand, seventy-two".