20857373 has 2 divisors, whose sum is σ = 20857374. Its totient is φ = 20857372.

The previous prime is 20857357. The next prime is 20857387. The reversal of 20857373 is 37375802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19518724 + 1338649 = 4418^2 + 1157^2 .

It is a cyclic number.

It is not a de Polignac number, because 20857373 - 2⁴ = 20857357 is a prime.

It is a super-2 number, since 2×20857373² = 870060016922258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20857313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10428686 + 10428687.

It is an arithmetic number, because the mean of its divisors is an integer number (10428687).

Almost surely, 2^20857373 is an apocalyptic number.

It is an amenable number.

20857373 is a deficient number, since it is larger than the sum of its proper divisors (1).

20857373 is an equidigital number, since it uses as much as digits as its factorization.

20857373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 20857373 is about 4566.9873001794. The cubic root of 20857373 is about 275.2663996995.

The spelling of 20857373 in words is "twenty million, eight hundred fifty-seven thousand, three hundred seventy-three".