20730036 has 12 divisors (see below), whose sum is σ = 48370112. Its totient is φ = 6910008.

The previous prime is 20730011. The next prime is 20730037. The reversal of 20730036 is 63003702.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20730036² = 859468785122592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20729994 and 20730021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730037) 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, 863740 + ... + 863763.

Almost surely, 2^20730036 is an apocalyptic number.

It is an amenable number.

20730036 is an abundant number, since it is smaller than the sum of its proper divisors (27640076).

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

20730036 is a wasteful number, since it uses less digits than its factorization.

20730036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727510 (or 1727508 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 20730036 is about 4553.0249285502. The cubic root of 20730036 is about 274.7050766604.

Adding to 20730036 its reverse (63003702), we get a palindrome (83733738).

The spelling of 20730036 in words is "twenty million, seven hundred thirty thousand, thirty-six".