20933287 has 2 divisors, whose sum is σ = 20933288. Its totient is φ = 20933286.

The previous prime is 20933249. The next prime is 20933291. The reversal of 20933287 is 78233902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20933287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20933207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10466643 + 10466644.

It is an arithmetic number, because the mean of its divisors is an integer number (10466644).

Almost surely, 2^20933287 is an apocalyptic number.

20933287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20933287 is an equidigital number, since it uses as much as digits as its factorization.

20933287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20933287 is about 4575.2909197121. The cubic root of 20933287 is about 275.5999551666.

The spelling of 20933287 in words is "twenty million, nine hundred thirty-three thousand, two hundred eighty-seven".