20257616 has 10 divisors (see below), whose sum is σ = 39249162. Its totient is φ = 10128800.

The previous prime is 20257613. The next prime is 20257619. The reversal of 20257616 is 61675202.

It is an interprime number because it is at equal distance from previous prime (20257613) and next prime (20257619).

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 6270016 = 3740^2 + 2504^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20257613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633035 + ... + 633066.

Almost surely, 2^20257616 is an apocalyptic number.

It is an amenable number.

20257616 is a deficient number, since it is larger than the sum of its proper divisors (18991546).

20257616 is a wasteful number, since it uses less digits than its factorization.

20257616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266109 (or 1266103 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20257616 is about 4500.8461426714. The cubic root of 20257616 is about 272.6022554824.

The spelling of 20257616 in words is "twenty million, two hundred fifty-seven thousand, six hundred sixteen".