20836740 has 48 divisors (see below), whose sum is σ = 58605120. Its totient is φ = 5531520.

The previous prime is 20836721. The next prime is 20836793. The reversal of 20836740 is 4763802.

20836740 is a nontrivial binomial coefficient, being equal to C(6456, 2).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20836698 and 20836707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15495 + ... + 16785.

It is an arithmetic number, because the mean of its divisors is an integer number (1220940).

Almost surely, 2^20836740 is an apocalyptic number.

20836740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

20836740 is the 6455-th triangular number and also the 3228-th hexagonal number.

It is an amenable number.

20836740 is an abundant number, since it is smaller than the sum of its proper divisors (37768380).

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

20836740 is a wasteful number, since it uses less digits than its factorization.

20836740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572 (or 1570 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20836740 is about 4564.7278122578. The cubic root of 20836740 is about 275.1756013445.

The spelling of 20836740 in words is "twenty million, eight hundred thirty-six thousand, seven hundred forty".