20780684 has 24 divisors (see below), whose sum is σ = 38320128. Its totient is φ = 9841040.

The previous prime is 20780659. The next prime is 20780689. The reversal of 20780684 is 48608702.

It is not an unprimeable number, because it can be changed into a prime (20780689) 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, 8789 + ... + 10899.

It is an arithmetic number, because the mean of its divisors is an integer number (1596672).

Almost surely, 2^20780684 is an apocalyptic number.

It is an amenable number.

20780684 is a deficient number, since it is larger than the sum of its proper divisors (17539444).

20780684 is a wasteful number, since it uses less digits than its factorization.

20780684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245 (or 2243 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 20780684 is about 4558.5835519380. The cubic root of 20780684 is about 274.9286161827.

The spelling of 20780684 in words is "twenty million, seven hundred eighty thousand, six hundred eighty-four".