20903893 has 2 divisors, whose sum is σ = 20903894. Its totient is φ = 20903892.

The previous prime is 20903887. The next prime is 20903899. The reversal of 20903893 is 39830902.

It is a balanced prime because it is at equal distance from previous prime (20903887) and next prime (20903899).

It can be written as a sum of positive squares in only one way, i.e., 19562929 + 1340964 = 4423^2 + 1158^2 .

It is a cyclic number.

It is not a de Polignac number, because 20903893 - 2¹³ = 20895701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20903899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10451946 + 10451947.

It is an arithmetic number, because the mean of its divisors is an integer number (10451947).

Almost surely, 2^20903893 is an apocalyptic number.

It is an amenable number.

20903893 is a deficient number, since it is larger than the sum of its proper divisors (1).

20903893 is an equidigital number, since it uses as much as digits as its factorization.

20903893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20903893 is about 4572.0775365254. The cubic root of 20903893 is about 275.4708978782.

The spelling of 20903893 in words is "twenty million, nine hundred three thousand, eight hundred ninety-three".