20945273 has 2 divisors, whose sum is σ = 20945274. Its totient is φ = 20945272.

The previous prime is 20945263. The next prime is 20945291. The reversal of 20945273 is 37254902.

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., 13778944 + 7166329 = 3712^2 + 2677^2 .

It is a cyclic number.

It is not a de Polignac number, because 20945273 - 2⁶ = 20945209 is a prime.

It is a super-2 number, since 2×20945273² = 877408922089058, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20945263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10472636 + 10472637.

It is an arithmetic number, because the mean of its divisors is an integer number (10472637).

Almost surely, 2^20945273 is an apocalyptic number.

It is an amenable number.

20945273 is a deficient number, since it is larger than the sum of its proper divisors (1).

20945273 is an equidigital number, since it uses as much as digits as its factorization.

20945273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20945273 is about 4576.6005943276. The cubic root of 20945273 is about 275.6525462191.

The spelling of 20945273 in words is "twenty million, nine hundred forty-five thousand, two hundred seventy-three".