20657069 has 2 divisors, whose sum is σ = 20657070. Its totient is φ = 20657068.

The previous prime is 20657053. The next prime is 20657083. The reversal of 20657069 is 96075602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 316969 = 4510^2 + 563^2 .

It is a cyclic number.

It is not a de Polignac number, because 20657069 - 2⁴ = 20657053 is a prime.

It is a super-2 number, since 2×20657069² = 853428999341522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20657269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328534 + 10328535.

It is an arithmetic number, because the mean of its divisors is an integer number (10328535).

Almost surely, 2^20657069 is an apocalyptic number.

It is an amenable number.

20657069 is a deficient number, since it is larger than the sum of its proper divisors (1).

20657069 is an equidigital number, since it uses as much as digits as its factorization.

20657069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 20657069 is about 4545.0048404815. The cubic root of 20657069 is about 274.3823891791.

It can be divided in two parts, 206 and 57069, that added together give a palindrome (57275).

The spelling of 20657069 in words is "twenty million, six hundred fifty-seven thousand, sixty-nine".