20616739 has 8 divisors (see below), whose sum is σ = 24221232. Its totient is φ = 17300640.

The previous prime is 20616707. The next prime is 20616749. The reversal of 20616739 is 93761602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20616739 - 2⁵ = 20616707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20616749) 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, 71944 + ... + 72229.

It is an arithmetic number, because the mean of its divisors is an integer number (3027654).

Almost surely, 2^20616739 is an apocalyptic number.

20616739 is a deficient number, since it is larger than the sum of its proper divisors (3604493).

20616739 is a wasteful number, since it uses less digits than its factorization.

20616739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144197.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20616739 is about 4540.5659338897. The cubic root of 20616739 is about 274.2037086013.

The spelling of 20616739 in words is "twenty million, six hundred sixteen thousand, seven hundred thirty-nine".