20463661 has 2 divisors, whose sum is σ = 20463662. Its totient is φ = 20463660.

The previous prime is 20463617. The next prime is 20463673. The reversal of 20463661 is 16636402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14485636 + 5978025 = 3806^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 20463661 - 2⁷ = 20463533 is a prime.

It is a super-2 number, since 2×20463661² = 837522843045842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20463761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10231830 + 10231831.

It is an arithmetic number, because the mean of its divisors is an integer number (10231831).

Almost surely, 2^20463661 is an apocalyptic number.

It is an amenable number.

20463661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20463661 is an equidigital number, since it uses as much as digits as its factorization.

20463661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20463661 is about 4523.6778178823. The cubic root of 20463661 is about 273.5233735248.

The spelling of 20463661 in words is "twenty million, four hundred sixty-three thousand, six hundred sixty-one".