20293391 has 2 divisors, whose sum is σ = 20293392. Its totient is φ = 20293390.

The previous prime is 20293381. The next prime is 20293397. The reversal of 20293391 is 19339202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20293391 - 2⁶ = 20293327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20293397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10146695 + 10146696.

It is an arithmetic number, because the mean of its divisors is an integer number (10146696).

Almost surely, 2^20293391 is an apocalyptic number.

20293391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20293391 is an equidigital number, since it uses as much as digits as its factorization.

20293391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 20293391 is about 4504.8186422985. The cubic root of 20293391 is about 272.7626331963.

The spelling of 20293391 in words is "twenty million, two hundred ninety-three thousand, three hundred ninety-one".