20735641 has 4 divisors (see below), whose sum is σ = 20985552. Its totient is φ = 20485732.

The previous prime is 20735639. The next prime is 20735647. The reversal of 20735641 is 14653702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20735641 - 2¹ = 20735639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20735647) 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 3 ways as a sum of consecutive naturals, for example, 124831 + ... + 124996.

It is an arithmetic number, because the mean of its divisors is an integer number (5246388).

Almost surely, 2^20735641 is an apocalyptic number.

It is an amenable number.

20735641 is a deficient number, since it is larger than the sum of its proper divisors (249911).

20735641 is an equidigital number, since it uses as much as digits as its factorization.

20735641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249910.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20735641 is about 4553.6404118024. The cubic root of 20735641 is about 274.7298327391.

The spelling of 20735641 in words is "twenty million, seven hundred thirty-five thousand, six hundred forty-one".