20706541 has 4 divisors (see below), whose sum is σ = 20822400. Its totient is φ = 20590684.

The previous prime is 20706503. The next prime is 20706557. The reversal of 20706541 is 14560702.

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 20706541 - 2²¹ = 18609389 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 (20706571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57661 + ... + 58018.

It is an arithmetic number, because the mean of its divisors is an integer number (5205600).

Almost surely, 2^20706541 is an apocalyptic number.

It is an amenable number.

20706541 is a deficient number, since it is larger than the sum of its proper divisors (115859).

20706541 is a wasteful number, since it uses less digits than its factorization.

20706541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115858.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20706541 is about 4550.4440442664. Note that the first 3 decimals coincide. The cubic root of 20706541 is about 274.6012557173.

The spelling of 20706541 in words is "twenty million, seven hundred six thousand, five hundred forty-one".