20517634 has 8 divisors (see below), whose sum is σ = 31094028. Its totient is φ = 10152960.

The previous prime is 20517631. The next prime is 20517641. The reversal of 20517634 is 43671502.

It can be written as a sum of positive squares in 2 ways, for example, as 18037009 + 2480625 = 4247^2 + 1575^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20517631) 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, 52687 + ... + 53074.

Almost surely, 2^20517634 is an apocalyptic number.

20517634 is a deficient number, since it is larger than the sum of its proper divisors (10576394).

20517634 is a wasteful number, since it uses less digits than its factorization.

20517634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105860.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20517634 is about 4529.6395000044. The cubic root of 20517634 is about 273.7636354696.

The spelling of 20517634 in words is "twenty million, five hundred seventeen thousand, six hundred thirty-four".