20682257 has 2 divisors, whose sum is σ = 20682258. Its totient is φ = 20682256.

The previous prime is 20682253. The next prime is 20682271. The reversal of 20682257 is 75228602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18696976 + 1985281 = 4324^2 + 1409^2 .

It is a cyclic number.

It is not a de Polignac number, because 20682257 - 2² = 20682253 is a prime.

It is a super-2 number, since 2×20682257² = 855511509228098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20682253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10341128 + 10341129.

It is an arithmetic number, because the mean of its divisors is an integer number (10341129).

Almost surely, 2^20682257 is an apocalyptic number.

It is an amenable number.

20682257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20682257 is an equidigital number, since it uses as much as digits as its factorization.

20682257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20682257 is about 4547.7749504565. The cubic root of 20682257 is about 274.4938657315.

The spelling of 20682257 in words is "twenty million, six hundred eighty-two thousand, two hundred fifty-seven".