20284973 has 2 divisors, whose sum is σ = 20284974. Its totient is φ = 20284972.

The previous prime is 20284937. The next prime is 20284981. The reversal of 20284973 is 37948202.

Together with previous prime (20284937) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18679684 + 1605289 = 4322^2 + 1267^2 .

It is a cyclic number.

It is not a de Polignac number, because 20284973 - 2¹² = 20280877 is a prime.

It is a super-2 number, since 2×20284973² = 822960259221458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20284903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10142486 + 10142487.

It is an arithmetic number, because the mean of its divisors is an integer number (10142487).

Almost surely, 2^20284973 is an apocalyptic number.

It is an amenable number.

20284973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20284973 is an equidigital number, since it uses as much as digits as its factorization.

20284973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20284973 is about 4503.8842125437. The cubic root of 20284973 is about 272.7249126496.

The spelling of 20284973 in words is "twenty million, two hundred eighty-four thousand, nine hundred seventy-three".