20721614 has 16 divisors (see below), whose sum is σ = 32199552. Its totient is φ = 9994488.

The previous prime is 20721611. The next prime is 20721629. The reversal of 20721614 is 41612702.

It is a self number, because there is not a number n which added to its sum of digits gives 20721614.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20721611) 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, 5687 + ... + 8589.

It is an arithmetic number, because the mean of its divisors is an integer number (2012472).

Almost surely, 2^20721614 is an apocalyptic number.

20721614 is a deficient number, since it is larger than the sum of its proper divisors (11477938).

20721614 is a wasteful number, since it uses less digits than its factorization.

20721614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031.

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

The square root of 20721614 is about 4552.0999549658. The cubic root of 20721614 is about 274.6678701076.

The spelling of 20721614 in words is "twenty million, seven hundred twenty-one thousand, six hundred fourteen".