20719541 has 2 divisors, whose sum is σ = 20719542. Its totient is φ = 20719540.

The previous prime is 20719537. The next prime is 20719547. The reversal of 20719541 is 14591702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14364100 + 6355441 = 3790^2 + 2521^2 .

It is a cyclic number.

It is not a de Polignac number, because 20719541 - 2² = 20719537 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20719547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10359770 + 10359771.

It is an arithmetic number, because the mean of its divisors is an integer number (10359771).

Almost surely, 2^20719541 is an apocalyptic number.

It is an amenable number.

20719541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20719541 is an equidigital number, since it uses as much as digits as its factorization.

20719541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 20719541 is about 4551.8722521617. The cubic root of 20719541 is about 274.6587105013.

The spelling of 20719541 in words is "twenty million, seven hundred nineteen thousand, five hundred forty-one".