20415316 has 6 divisors (see below), whose sum is σ = 35726810. Its totient is φ = 10207656.

The previous prime is 20415313. The next prime is 20415319. The reversal of 20415316 is 61351402.

It is an interprime number because it is at equal distance from previous prime (20415313) and next prime (20415319).

It can be written as a sum of positive squares in only one way, i.e., 19395216 + 1020100 = 4404^2 + 1010^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2551911 + ... + 2551918.

Almost surely, 2^20415316 is an apocalyptic number.

It is an amenable number.

20415316 is a deficient number, since it is larger than the sum of its proper divisors (15311494).

20415316 is a wasteful number, since it uses less digits than its factorization.

20415316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5103833 (or 5103831 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20415316 is about 4518.3311078317. The cubic root of 20415316 is about 273.3078057989.

Adding to 20415316 its reverse (61351402), we get a palindrome (81766718).

The spelling of 20415316 in words is "twenty million, four hundred fifteen thousand, three hundred sixteen".