20502973 has 2 divisors, whose sum is σ = 20502974. Its totient is φ = 20502972.

The previous prime is 20502967. The next prime is 20502991. The reversal of 20502973 is 37920502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13675204 + 6827769 = 3698^2 + 2613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20502973 is a prime.

It is a super-3 number, since 3×20502973³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20502943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251486 + 10251487.

It is an arithmetic number, because the mean of its divisors is an integer number (10251487).

Almost surely, 2^20502973 is an apocalyptic number.

It is an amenable number.

20502973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20502973 is an equidigital number, since it uses as much as digits as its factorization.

20502973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 20502973 is about 4528.0208700932. The cubic root of 20502973 is about 273.6984134427.

The spelling of 20502973 in words is "twenty million, five hundred two thousand, nine hundred seventy-three".