20515116 has 12 divisors (see below), whose sum is σ = 47868632. Its totient is φ = 6838368.

The previous prime is 20515111. The next prime is 20515133. The reversal of 20515116 is 61151502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 20515092 and 20515101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854785 + ... + 854808.

Almost surely, 2^20515116 is an apocalyptic number.

It is an amenable number.

20515116 is an abundant number, since it is smaller than the sum of its proper divisors (27353516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20515116 is a wasteful number, since it uses less digits than its factorization.

20515116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709600 (or 1709598 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 20515116 is about 4529.3615444122. The cubic root of 20515116 is about 273.7524359159.

Adding to 20515116 its reverse (61151502), we get a palindrome (81666618).

The spelling of 20515116 in words is "twenty million, five hundred fifteen thousand, one hundred sixteen".