20616943 has 4 divisors (see below), whose sum is σ = 20627488. Its totient is φ = 20606400.

The previous prime is 20616931. The next prime is 20616961. The reversal of 20616943 is 34961602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20616943 - 2²¹ = 18519791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20616923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1383 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (5156872).

Almost surely, 2^20616943 is an apocalyptic number.

20616943 is a deficient number, since it is larger than the sum of its proper divisors (10545).

20616943 is an equidigital number, since it uses as much as digits as its factorization.

20616943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10544.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20616943 is about 4540.5883979943. The cubic root of 20616943 is about 274.2046130019.

The spelling of 20616943 in words is "twenty million, six hundred sixteen thousand, nine hundred forty-three".