20706538 has 8 divisors (see below), whose sum is σ = 31094532. Its totient is φ = 10341696.

The previous prime is 20706503. The next prime is 20706557. The reversal of 20706538 is 83560702.

It can be written as a sum of positive squares in 2 ways, for example, as 20675209 + 31329 = 4547^2 + 177^2 .

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

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, 3345 + ... + 7252.

Almost surely, 2^20706538 is an apocalyptic number.

20706538 is a deficient number, since it is larger than the sum of its proper divisors (10387994).

20706538 is a wasteful number, since it uses less digits than its factorization.

20706538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11576.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20706538 is about 4550.4437146283. The cubic root of 20706538 is about 274.6012424558.

The spelling of 20706538 in words is "twenty million, seven hundred six thousand, five hundred thirty-eight".