20781614 has 16 divisors (see below), whose sum is σ = 36384768. Its totient is φ = 8716632.

The previous prime is 20781583. The next prime is 20781617. The reversal of 20781614 is 41618702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20781617) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15134 + ... + 16449.

It is an arithmetic number, because the mean of its divisors is an integer number (2274048).

Almost surely, 2^20781614 is an apocalyptic number.

20781614 is a deficient number, since it is larger than the sum of its proper divisors (15603154).

20781614 is a wasteful number, since it uses less digits than its factorization.

20781614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31639.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20781614 is about 4558.6855561664. The cubic root of 20781614 is about 274.9327174240.

The spelling of 20781614 in words is "twenty million, seven hundred eighty-one thousand, six hundred fourteen".