20294381 has 2 divisors, whose sum is σ = 20294382. Its totient is φ = 20294380.

The previous prime is 20294371. The next prime is 20294387. The reversal of 20294381 is 18349202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15476356 + 4818025 = 3934^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 20294381 - 2¹⁸ = 20032237 is a prime.

It is a super-2 number, since 2×20294381² = 823723800346322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (20294387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10147190 + 10147191.

It is an arithmetic number, because the mean of its divisors is an integer number (10147191).

Almost surely, 2^20294381 is an apocalyptic number.

It is an amenable number.

20294381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20294381 is an equidigital number, since it uses as much as digits as its factorization.

20294381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20294381 is about 4504.9285232953. The cubic root of 20294381 is about 272.7670686406.

The spelling of 20294381 in words is "twenty million, two hundred ninety-four thousand, three hundred eighty-one".