20139634 has 8 divisors (see below), whose sum is σ = 30342060. Its totient is φ = 10025616.

The previous prime is 20139619. The next prime is 20139643. The reversal of 20139634 is 43693102.

It can be written as a sum of positive squares in 2 ways, for example, as 18896409 + 1243225 = 4347^2 + 1115^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21529 + ... + 22444.

Almost surely, 2^20139634 is an apocalyptic number.

20139634 is a deficient number, since it is larger than the sum of its proper divisors (10202426).

20139634 is a wasteful number, since it uses less digits than its factorization.

20139634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44204.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20139634 is about 4487.7203567067. The cubic root of 20139634 is about 272.0720055185.

The spelling of 20139634 in words is "twenty million, one hundred thirty-nine thousand, six hundred thirty-four".