20825993 has 2 divisors, whose sum is σ = 20825994. Its totient is φ = 20825992.

The previous prime is 20825989. The next prime is 20825999. The reversal of 20825993 is 39952802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19598329 + 1227664 = 4427^2 + 1108^2 .

It is a cyclic number.

It is not a de Polignac number, because 20825993 - 2² = 20825989 is a prime.

It is not a weakly prime, because it can be changed into another prime (20825999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10412996 + 10412997.

It is an arithmetic number, because the mean of its divisors is an integer number (10412997).

Almost surely, 2^20825993 is an apocalyptic number.

It is an amenable number.

20825993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20825993 is an equidigital number, since it uses as much as digits as its factorization.

20825993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 20825993 is about 4563.5504818069. The cubic root of 20825993 is about 275.1282839495.

The spelling of 20825993 in words is "twenty million, eight hundred twenty-five thousand, nine hundred ninety-three".