20764243 has 2 divisors, whose sum is σ = 20764244. Its totient is φ = 20764242.

The previous prime is 20764231. The next prime is 20764297. The reversal of 20764243 is 34246702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20764243 - 2⁹ = 20763731 is a prime.

It is not a weakly prime, because it can be changed into another prime (20764213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382121 + 10382122.

It is an arithmetic number, because the mean of its divisors is an integer number (10382122).

Almost surely, 2^20764243 is an apocalyptic number.

20764243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764243 is an equidigital number, since it uses as much as digits as its factorization.

20764243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 20764243 is about 4556.7798937408. The cubic root of 20764243 is about 274.8560921991.

The spelling of 20764243 in words is "twenty million, seven hundred sixty-four thousand, two hundred forty-three".