20685373 has 2 divisors, whose sum is σ = 20685374. Its totient is φ = 20685372.

The previous prime is 20685367. The next prime is 20685377. The reversal of 20685373 is 37358602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12545764 + 8139609 = 3542^2 + 2853^2 .

It is a cyclic number.

It is not a de Polignac number, because 20685373 - 2²¹ = 18588221 is a prime.

It is a super-2 number, since 2×20685373² = 855769312298258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20685377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10342686 + 10342687.

It is an arithmetic number, because the mean of its divisors is an integer number (10342687).

Almost surely, 2^20685373 is an apocalyptic number.

It is an amenable number.

20685373 is a deficient number, since it is larger than the sum of its proper divisors (1).

20685373 is an equidigital number, since it uses as much as digits as its factorization.

20685373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20685373 is about 4548.1175226680. The cubic root of 20685373 is about 274.5076501706.

The spelling of 20685373 in words is "twenty million, six hundred eighty-five thousand, three hundred seventy-three".