22720541 has 2 divisors, whose sum is σ = 22720542. Its totient is φ = 22720540.

The previous prime is 22720531. The next prime is 22720583. The reversal of 22720541 is 14502722.

22720541 = 3370² + 3371².

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11363641 + 11356900 = 3371^2 + 3370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22720541 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22720501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11360270 + 11360271.

It is an arithmetic number, because the mean of its divisors is an integer number (11360271).

Almost surely, 2^22720541 is an apocalyptic number.

22720541 is the 3371-st centered square number.

It is an amenable number.

22720541 is a deficient number, since it is larger than the sum of its proper divisors (1).

22720541 is an equidigital number, since it uses as much as digits as its factorization.

22720541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 22720541 is about 4766.6068644267. The cubic root of 22720541 is about 283.2301980643.

The spelling of 22720541 in words is "twenty-two million, seven hundred twenty thousand, five hundred forty-one".