20295661 has 8 divisors (see below), whose sum is σ = 20745720. Its totient is φ = 19848192.

The previous prime is 20295631. The next prime is 20295673. The reversal of 20295661 is 16659202.

20295661 = 384² + 385² + ... + 489².

It can be written as a sum of positive squares in 4 ways, for example, as 1102500 + 19193161 = 1050^2 + 4381^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20295661 - 2¹⁷ = 20164589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20295631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29821 + ... + 30493.

It is an arithmetic number, because the mean of its divisors is an integer number (2593215).

Almost surely, 2^20295661 is an apocalyptic number.

It is an amenable number.

20295661 is a deficient number, since it is larger than the sum of its proper divisors (450059).

20295661 is an equidigital number, since it uses as much as digits as its factorization.

20295661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 20295661 is about 4505.0705876823. The cubic root of 20295661 is about 272.7728031426.

The spelling of 20295661 in words is "twenty million, two hundred ninety-five thousand, six hundred sixty-one".