20517652 has 12 divisors (see below), whose sum is σ = 35974260. Its totient is φ = 10239296.

The previous prime is 20517649. The next prime is 20517661. The reversal of 20517652 is 25671502.

It can be written as a sum of positive squares in 2 ways, for example, as 2421136 + 18096516 = 1556^2 + 4254^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20517652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2377 + ... + 6832.

It is an arithmetic number, because the mean of its divisors is an integer number (2997855).

Almost surely, 2^20517652 is an apocalyptic number.

It is an amenable number.

20517652 is a deficient number, since it is larger than the sum of its proper divisors (15456608).

20517652 is a wasteful number, since it uses less digits than its factorization.

20517652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9770 (or 9768 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 20517652 is about 4529.6414869170. The cubic root of 20517652 is about 273.7637155267.

The spelling of 20517652 in words is "twenty million, five hundred seventeen thousand, six hundred fifty-two".